Spin Off of 2015 list (5E9-A) Im gonna build the 5G9 instead

[lego4040]

So Id like to give that 5E9-A a shot. Here is a older thread from here http://el34world.com/Forum/index.php?topic=16303.0  and here is a great thread following a build http://www.thegearpage.net/board/showthread.php?t=1207200 .WIth the Hammond 290Cax I still have in the box I hope I can use this PT. Its 330-0-330 @ 115ma or (275-0-275 with lower B+taps)/6.3v @2A and 5v@2A. . I can use the 5E5A chassis(which has same holes but would have a different cover plate)or a kit and change board and various part changes.
I will do what I usually which is researching and take advice. I like the 5E5A for th3 15" can you hear me know speaker. The Rectifier on the 5E5A is the 5u4G and has the 6L6's instead off 6V6's(That could work?)
Im willing to build this and post project And get more people interseted in building like the AC 15 took off

[Willabe]

WIth the Hammond 290Cax I still have in the box I hope I can use this PT. Its 330-0-330 @ 115ma or (275-0-275 with lower B+taps)/6.3v @2A and 5v@2A.

I like the 5E5A for th3 15" can you hear me know speaker. The Rectifier on the 5E5A is the 5u4G and has the 6L6's instead off 6V6's(That could work?)

6l6's need .9A for heaters, so 2x.9=1.8A, only 200mA left for 3x12 _ _ 7. They need 300mA each so .9A. 5E5A needs at least 2.7A's for heater. 5U4GB needs 3A for it's heater, your PT only has 2A.

Also not enough B+ current for a 5E5A with 2x6L6. That's a ~35w amp.

If your thinking about building a 5E9A you might want to consider a 5G9 instead? I built a 5G9 and love it!!!!!! I like it more then my 5E3 tweed Deluxe, way better!


                       Brad     

[lego4040]

  not only was I watching videos of both the 5e9-a & 5G9 but Rory Gallagher's Irish Tour on my commute home. I see your a fan by your avatar. You have a BOM list floating around? I understand both are great amps and the few I saw William Yates(Red Jones Ams) testing was of the hook

[Willabe]

Rory who?     

oh now you did it, you put a quarter in the juke box.   

Are you kiddin me! Irish Tour!  1 of the best live recordings of a guitar player/singer and his band ever made, well, IMO.   
That DVD, I think they messed it up, they should have just had a camera out front so you could see Rory and his band and leave it at that.           

I saw him play a few times and the 1st time was at the Aragon Ballroom in Chgo., early 76'. He was at the hight of his abilities IMO.
   

I met him a few times and had a few bears with him in a couple of blues clubs I used to hang and play in, very nice guy, respectful, a true gentleman and not blasted out of his mind. Didn't talk about himself, liked to talk shop about the older blues guys.


                     Brad          

[Willabe]

You have a BOM list floating around?

Sorry, no. I keep a lot of parts so I don't make a BOM.

It's not a large circuit, wont be hard for you to make a list if you decide to build it. Front end preamp is a tweed Deluxe 5E3 exactly.

Like I said I have not built a 5E9A but I did build both a tweed Deluxe 5E3 and the tweed Tremolux 5G9. I much prefer the 5G9.

I did a thread on the 5G9 that has schematics and my layout drawings plus pictures, do a search.


                      Brad     

[lego4040]

Sorry I wasn't clearer, I meant a list of things for the 5G9 you built.  I will do a search tonight. I was turned onto Rory 25yrs ago and was blown away. So many guys like him who deserve to be on that top 10 list, ex: Robin Trower, Frank Marino, Pat Travers....... I will look you up for that build. Thanks for the help. I just built built a amp for my stereo and I cant wait to put my 30yr old Trower live album on it

[Willabe]

Sorry I wasn't clearer, I meant a list of things for the 5G9 you built. 

No, I didn't make a BOM for the 5G9. I keep most of the R's/C's/pots, ect. on hand, so I don't usually make a BOM.


                Brad     

 

[lego4040]

I found your old thread  thanks mate. Lots of reading and parts hunting to do. Doug sells the board here for the 5E9 but I'm sure since there is a layout I can get a 5g9. The greater Blues man I got to meet and chat with was Clarence Gatmouth Brown years ago at the Kit Kat club here in NYC

[Willabe]

Yeah Gatemouth was great!

I saw him up close (~25'?) in a club that held ~350(?) in the early 90's(?) playin on his Firebird. He still had it.


                  Brad     

[Willabe]

I found your old thread  thanks mate.

I can't find it, will you please post the link? 


                Brad   

[lego4040]

Hopefully this is it, maybe we can get Another project going. This is what I found http://el34world.com/Forum/index.php?topic=13912.0

[Willabe]

Yep, that's it, thank you.


               Brad     

[lego4040]

I'll Be The Guinea Pig and hopefully we can get a 5G9 going. I will have about a $900.00 budget to start and I'd like to keep that here with Doug's business. I know he doesn't sell the chassis or cabinet and speaker but that's OK. I think I'll use the 5E5-A 1x12 or 15" because that chassis will work and its the narrow tweed cab and correct size speaker I believe. I'd love all the input like the Vox build, Between Sluckey, Ed, Doug, etc.... We got a legit AC 15 build with people building them now. This is what Id like to do again with the 5G9   So I will contact Doug on making me a 5G9 eyelet board on the turret board material. Start a BOM(I will Gladly take all recommendations on Parts) keeping as much parts as possible this site. Time to go and do weekend things(errands) Tonight hopefully I'll do some ordereing

[Ed_Chambley]

Yeah Gatemouth was great!

I saw him up close (~25'?) in a club that held ~350(?) in the early 90's(?) playin on his Firebird. He still had it.


                  Brad     

Would you believe that I played with him many times at a old blues club we used to have here in Atlanta.  The place was called The Northside Tavern.  Tinsley Ellis is a great friend and I played with him often in the old days and another guy I cant remember his last mane, but his first name is Johnny and he always played a Gold Glitter Telecaster.

Anyway, the only thing with Gatemouth is he would do the teeth playing a tad to often IMO.  Seems like if any new people came in the club he would do it again. 

I have a 5G9 I built on Brad's advice, but I do not have tremolo since I just converted another build on it.  I think it needs tremolo, but you have a Revibe.  I dont know what the difference is in the tremolo hitting the front or mixed later in the circuit.

  Great sounding amp through a Alnico 12, but I have a JBL130 Mine is a D-130 but I like the E-130 too.  It is a 15 inch speaker.

I have a 5E5 pro circuit I have put together  on my bench right now.  It is really nice I have to say.  It has a 6K primary at 8 ohms on the OT and I believe this is the one that is 35 watts.  I thought the 5E5a was the 40 watt.

If you are want a tweed with a sweet tone the 5G9 is great, if you want that tweed roar build the Pro IMO.

[Ed_Chambley]

I'll Be The Guinea Pig and hopefully we can get a 5G9 going. I will have about a $900.00 budget to start and I'd like to keep that here with Doug's business. I know he doesn't sell the chassis or cabinet and speaker but that's OK. I think I'll use the 5E5-A 1x12 or 15" because that chassis will work and its the narrow tweed cab and correct size speaker I believe. I'd love all the input like the Vox build, Between Sluckey, Ed, Doug, etc.... We got a legit AC 15 build with people building them now. This is what Id like to do again with the 5G9   So I will contact Doug on making me a 5G9 eyelet board on the turret board material. Start a BOM(I will Gladly take all recommendations on Parts) keeping as much parts as possible this site. Time to go and do weekend things(errands) Tonight hopefully I'll do some ordereing

Notice Brad made a different layout and used Panasonic radials. Very cool layout and a smudge  different from the original.

[Willabe]

Would you believe that I played with him many times at a old blues club we used to have here in Atlanta.  The place was called The Northside Tavern.  Tinsley Ellis is a great friend and I played with him often in the old days and another guy I cant remember his last mane, but his first name is Johnny and he always played a Gold Glitter Telecaster.

Wow! Nice!!!!!!     

I have a 5G9 I built 

Ed, what do think about any difference in sound between a 5E3 and the 5G9?  I know you've played through both.   

I dont know what the difference is in the tremolo hitting the front or mixed later in the circuit.

That's a very good question.

TQR mag. has reviewed a number of old Gibby (and other new) amps that had trem injected into different points of the circuit. They said that some of them that had the trem at the 1st preamp tube sounded great, with a 'deep throb'.

Our friend Tubeswell loves the Fender 5G9 and 6G16 and has built both. Say's their the king of tube trems. I don't know if he's built a trem amp where it was injected at the 1st preamp tube?

I have a 5E5 pro circuit I have put together  on my bench right now.  It is really nice I have to say.  It has a 6K primary at 8 ohms on the OT and I believe this is the one that is 35 watts.  I thought the 5E5a was the 40 watt.

5E5 was a tweed Deluxe but with 6l6's, 30w, 5E5A was a 35w, same/close to Bandmaster 5E7, Bassman 5D6A/5E6/5E6A, had 2x5U4 rect. and 5D8/5E8A, had 2x5U4 rect. and 4x6L6's. All had different size/# of speakers. This is the amp series Gibson copied some of their (later model) GA77/70 from.


                      Brad     

[Ed_Chambley]

5E5 was a tweed Deluxe but with 6l6's, 30w, 5E5A was a 35w, same/close to Bandmaster 5E7, Bassman 5D6A/5E6/5E6A, had 2x5U4 rect. and 5D8/5E8A, had 2x5U4 rect. and 4x6L6's. All had different size/# of speakers. This is the amp series Gibson copied some of their (later model) GA77/70 from

I have to respectfully disagree.

From Ampwares:
Fender Pro
 Model/Circuit Number: 5E5 (55), 5E5-A (56-60)
 Years of Production: 1955-1960
 Era: Narrow Panel
 Configuration: Combo
 Controls: Chrome top facing w/ white screened labels, controls numbered 1-12
 Knobs: Black Chicken Head
 Faceplate
 

• Front: 5E5: Ground Sw, Fuse (3A), Power Sw, Standby Sw, Pilot Lamp, Tone, Vol, Mic Vol, In, In, Mic In, Mic In 5E5-A: Ground Sw, Fuse (3A), Power Sw, Standby Sw, Pilot Lamp, Presence, Bass, Treb, Vol, Mic Vol, In, In, Mic In, Mic In
• Rear:

Cabinet
 

• Dimensions: 20” x 22” x 10”
• Hardware: Leather Handle(1955-58), Brown Dogbone (1959-1960)
• Handle: Flat Leather Handle
• Feet: Nail in Feet
• Corners: None

Protect your amp with aFender Pro (Narrow Panel) Style Cover

 
Covering Material
 

• Tolex/Tweed: Diagonal tweed
• Grill Cloth: Oxblood with Stripe

Logo: Cabinet mounted, Script
 Weight:
 Speaker
 

• Size: 1×15”
• Impedance: 8 ohms
• Model: Jensen P15N(For more info, check out the Jensen Replacement Speakers)

Effects: None
 ~Watts: 35-40 Watts
 Tubes
 

• Pre amp: 5E5: Mic: 12AY7, Instrument: 12AY7, ½ 12AX7 shared by both channels 5E5-A: Mic: ½ 12AY7, Instrument: ½ 12AY7, 12AY7 and ½ 12AX7 shared by both channels Phase Inverter: ½ 12AX7 (split load)
• Power: 2 x 6L6GB or 5881 (58-60)

Bias: 5E5: Cathode biased 5E5-A: Fixed bias, nonadjustable
 Rectifier: 5U4GA
Comments: * Model 5E5 had the negative feedback loop is removed. * Model 5E5-A returned the negative feedback loop with the addition of the Presence control. * A selenium rectifier is used in model 5E5-A’s bias circuit.


 

[Ed_Chambley]

Ed, what do think about any difference in sound between a 5E3 and the 5G9?  I know you've played through both.   

The 5G9 handles humbuckers a LOT better in the stock form.  Don't know why as I have never compared the schematics.  The tone is more focused as the bottom is not as greasy.  Smooth distortion and moves into distortion slower, more gradual.

[Willabe]

Notice Brad made a different layout and used Panasonic radials. Very cool layout and a smudge  different from the original.

I'd definitely change some of that layout now that I see it in real life and not on a computer screen.   

I think it was pretty good and it works fine but I know I could make it a little better and a little easer to wire up.

1. I started with a -bias/balance that didn't work because of the -bias trem. Sluckey and Ed came up with a good way to do a dual -bias that Ed put in at least 1 amp build he did and it worked great for him.

2. I did most of the LFO and it's driver as point to point to keep the wiring as short as possible and I did not like wiring that up at all!         

Now I would definitely look at Sluckeys layout for the LFO/driver on his Vox AC15 and see if I could use that as it's a proven circuit layout! Sooooo much easer to wire up! It might have to be altered a little for the Fender circuit but their pretty close IIRC, so shouldn't be hard to do as it's 90% to 95% the same?

3. I'd change the B+ 2x 20uF caps, 1 for each 1st preamp plate to a single 10uF or an 8uF cap. My reasoning on doing it the way I did was off and not needed.

4. There's some little things I'd move a little this way or that way, nothing major.

That's what I can think of off the top of my head.


                            Brad       

[Willabe]

The 5G9 handles humbuckers a LOT better in the stock form.  Don't know why as I have never compared the schematics.  The tone is more focused as the bottom is not as greasy.  Smooth distortion and moves into distortion slower, more gradual.

That's pretty much how I hear it too and why I like it much better than my 5E3.   

Plus it's got killer TREM!   

Slap a Fender stand alone reverb in the front and woooooow! Killer rig!!!!!!

Funny thing when TQR mag. reviewed the old GA77 they bought they said it reminded them a lot of the old G5G9 they had bought. Hmmmmm........   

1. Front end preamp is exact for both, including the 2x (interactive) volume controls and single tone control.

2. PI's are different. 5E3 is a concertina, 5G9 is a LTPI.

3. 5E3 is cathode biased, the 5G9 is -bias.

4. 5E3 uses a 5Y3 rectifier tube and the 5G9 uses a 5U4.

5. 5E3 has a little less B+ filtering and the 5G9 has a little more B+ filtering and a choke.

6. B+ voltages are not that different, IIRC?

7. Neither amp uses NFB.


                       Brad     

[VMS]

  8. 5G9 uses .02 coupling caps to power tubes, 5E3 has .100 caps

[Willabe]

Good catch.


              Brad   

[lego4040]

Here is a Google doc spread sheet I start but haven't finished. If you have part#'s you would like me to add from different mfr's (PT/OT/CHOKE)as an example, I will add it to list. I'd Like to be able to share and have someone else be able to build one as well
https://docs.google.com/spreadsheets/d/1JQudceIz6xeLsOiIxg76MWDUk9usP0VcYBe5Qmlnxls/edit?usp=sharing

[Willabe]

Here is a Google doc spread sheet I start but haven't finished.

Very nice.   

If you have part#'s you would like me to add from different mfr's (PT/OT/CHOKE)as an example, I will add it to list. 

That's the thing, what iron set?

I used Merc. Mag. because I wanted to get pretty close for my build, but most guys probably will want to use a less expensive set of iron. Which is fine and will work just as well or better. I'm still hoping on building a few more to sell, so I'd be interested to find a different set.

Doug's 6V6 choke will work great and is shielded, steel bell ends. His Fender style Princeton or Deluxe reverb OT should work great and they are both shielded as well.

So you have to figure out what PT mainly.

Amp PT needs at least;

Fender schemo says, 300-0-300 B+ secondary, 370dcv at 1st B+ node, OT CT feed, a little more wont hurt, but at what current? It's a 15/20w amp, so, a 100mA to 120mA? And a 50acv to 60acv bias tap would make things easy.

(It's pretty much a 5E9A tweed Tremolux or a brown(?) Princeton 6G2, both have same tube count, but who makes those and B+ is different, so is the rectifier current, so....... or a 5E3 tweed Deluxe without trem is close, 1 less 12 _ _ 7 and only 2A for rectifier heater. Princeton AA964 B+ is 50dcv higher at B+ 1st node and only has 2A for 5v rectifier heater and 1 less 12 _ _ 7.)   

3A@5v for 5U4GB rectifier tube. (Although switching to a GZ34/5AR4 might make things easer?)

1.8A@6.3 for tube heaters, 2x6V6= .9A (4.5A each), 3x12 _ _ 7= .9A (300mA each)

Tomorrow I'll take some voltage readings on my 5G9 and 5E3 and post them just for a reference.


                          Brad     

[Ed_Chambley]

Any tried a Master Volume PPIMV or other?

How about an effects loop.  The amp is very simple and had a great tone, s each could be switchable.  The 5G9 has to be played at a little higher volume to get the goods from it and modulation pedals like Chorus do not sound as good hitting the front.

Seems the 5G9 is more mid focused which will make it love overdrive pedals, especially boost pedals.  I have noticed the gain in V1, like 12AY7 trending to the lower gain makes it so you can hit it harder.

The Iron I used was an old Thodarson  NOS  300-0-300, 120ma / 6.3 @ 2a / 5v @ 3

I used a OT from a Hammond tone cabinet.  Don't know the Manufacturer, but it is 10K/8ohm and it had a great tone.  I tried a Stancor 6k6 / 8 ohm, too much too clean.

[lego4040]

I will write those numbers down and do some research today. My 4 year old daughter just got over being sick and in the hospital and my 8 year old daughter woke up in the middle off the night throwing up

[Willabe]

Thanks Ed, this is good stuff to know. I went to bed last night and thought, Doh, ask Ed what he used for iron.   

The Iron I used was an old Thodarson  NOS  300-0-300, 120ma / 6.3 @ 2a / 5v @ 3

Bingo!     

What dcv did you end up with at the 1st B+ node? And did/are you using a 5U4 rectifier?

I used a OT from a Hammond tone cabinet.  Don't know the Manufacturer, but it is 10K/8ohm and it had a great tone.  I tried a Stancor 6k6 / 8 ohm, too much too clean.

Huh........ was the Stancor 6K6 bigger than a standard knock off Fender BF Deluxe reverb OT? How about the tone cab OT, bigger then a BF Deluxe?

That's why I like it better then my 5E3, it's cleaner.   


                                  Brad     

[Willabe]

I will write those numbers down and do some research today. My 4 year old daughter just got over being sick and in the hospital and my 8 year old daughter woke up in the middle off the night throwing up

Oh man, forget us and this amp stuff, take care of them for now. The thread can wait, it'll still be here when their both better.


                Brad   

[lego4040]

Daughter work up with fever dreams while I was putting this together,So this is what I got on transformer sets.
From Here at Hoffman's: PT=Deluxe 041316, OT=Heyboer Output Deluxe, Choke= Small Fender

125C3A

Mercury Magnetics: PT=FTTP-M, OT=FTTO, Choke=FC-TTREM
From ClassicTone: PT=40-18041, OT=40-18090, Choke=40-18040
If someone else can help me verify these I will add to the spread sheet
This bundle set from triode looks right and the price is right http://www.triodeelectronics.com/deluxeppbundle.htmlthis one has lower B+300-0-300 option. Seems Classictone has Lots of options

[Willabe]

Doug's Deluxe PT only has 2A@5acv for rect. heater, maybe a 5V4 would lower the B+ dcv a little closer to the 370dcv B+ Fender list's? Might work nice. 

Link for Triodes classic tone Deluxe PT spec sheet below, has 3A@5acv rect. heater. Look at the bottom left corner it gives loaded B+ dcv's for GZ34/5AR4/5Y3/5U4 rectifier tubes, are the 5Y3 and 5U4 dcv's flipped? Might work.
 
http://www.classictone.net/40-18016.pdf


               Brad     

[lego4040]

I used the current calculator and your right, those numbers might be flipped. The 5y3 was less then the 5u4gb. This model http://www.classictone.net/40-18028.pdf has 375B+ using 330-0-330 & -50 bias tap & I believe enough amps for the 6.3 volt & 5 volt heaters. If this is good I'll stop looking for that part and move on to next. So the -50v bias goes to a 1n4007(since sel rectifier) are no longer. Like this

[Willabe]

I used the current calculator and your right, those numbers might be flipped. The 5y3 was less then the 5u4gb.

Yeah, 1 of my tube books (GE) say's;

5Y3G/GA/GT, tube voltage drop, 60v@125mA for all 3 versions.

5U4G/GA,      tube voltage drop, 44v@225mA for both

5U4GB,          tube voltage drop, 50v@275mA

So, since the dcv's listed on the Classic Tone spec sheet are for 120mA any of the 5U4's at ~1/2 their current ability should drop way less then a 5Y3 mA limit.

I believe enough amps for the 6.3 volt & 5 volt heaters.

Yes.

So the -50v bias goes to a 1n4007(since sel rectifier) are no longer.

Yes, the ss 1n4007 replaces the old style selenium rectifier.

The PT you just linked to looks like another good possibility for ~370 B+ with a 5U4 and 300-0-300 taps, might need to use a different rectifier tube? The B+ dcv's they list are at 120mA current so at idol (which is what the Fender specs are) will be higher.

How much?   


                      Brad     

[lego4040]

Added Transformers to Document that I think will work. The Mercs will for sure, It was put in a build that was on another site
https://docs.google.com/spreadsheets/d/1JQudceIz6xeLsOiIxg76MWDUk9usP0VcYBe5Qmlnxls/edit?usp=sharing
Comments most welcome!!!!!! Gnite

[lego4040]

For the .03uf-400v capacitor in this build, what would you recommend to use? Schem shows +270vdc going through, I can only find Jupiter cap$$$ or I could stack .02&.01in parallel to get the .03. Also the .005 on the tone cap to ground. I'll will use a silver mica that goes from tone to vol pot though

[Ed_Chambley]

For the .03uf-400v capacitor in this build, what would you recommend to use? Schem shows +270vdc going through, I can only find Jupiter cap$$$ or I could stack .02&.01in parallel to get the .03. Also the .005 on the tone cap to ground. I'll will use a silver mica that goes from tone to vol pot though

Doug has a .033uf/630v Orange drop.

[sluckey]

I'd use the same as we used in the AC15. It's the cute little blue Xicon chicklet that Doug sells. Doug also has it in ODs and M150s.

[lego4040]

Thanks Ed, I would guess the blue chicklet  .0047uf for the .005. I'll try and get the caps and resistors on the document tonight. The 1 watt resistors on the sockets I'll bump up to 3watts as well as the 10k off the choke and the 100k I'll be using in series with the IN4007

[lego4040]

Next step is find and draw out the bias pot mod

[Willabe]

For the .03uf-400v capacitor in this build, what would you recommend to use?

The 3 caps in the LFO, 2x.01, 1@.03, you can juggle those values.

You can do what Sluckey said or you can make the 1@.03 a .02 and change 1 of the .01's to a .02, adds up the same.

That's what I did. You can use all ceramic disk caps for those caps.


                               Brad     

[Willabe]

The 1 watt resistors on the sockets I'll bump up to 3watts........ and the 100k I'll be using in series with the IN4007

I see 82K for the series dropping R in the -bias supply. There's really no current draw in the -bias circuit so a 1w MF FP(metal film, flame proof) should be plenty.


                  Brad          

[DummyLoad]

hammond 272DX will work.


--pete

[Willabe]

Oh, I see, 100K in the in the hand written note on the Fender schemo.   

You don't need that. Just change the old selenium rectifier to a ss type, 1N4007 will work fine.


                    Brad     

[lego4040]

No 100k, gotcha. It was on one thread that I read should the diode go bad and let let voltage back the wrong way. I started looking at the Hammonds fender cross references on my way home tonight but didn't finish

[lego4040]

Something like this for the Biasing?

[lego4040]

I didn't see a 50v bias tap on that 272dx, this one looks about right
http://www.hammondmfg.com/pdf/EDB372FX.pdf. It's 120$ at mouser

[DummyLoad]

2xx hammonds don't have a bias tap and are 120V (115/125) and they cost less than their 3xx counterparts. also, the 3xx has an expanded line (higher VA offerings) on some voltage ranges.


i forgot that point. use the 3xx series to keep the bias ckt. the same as the fender plan.


--pete

[sluckey]

That 18K needs to be in SERIES with the bias pot. Otherwise, when you crank the bias pot to one end, you will put a dead short on your bias voltage. The tubes will not like that.

I would also put a 470Ω/1W resistor in series with the diode, just like Fender did on so many of their blackface amps.

[DummyLoad]

I didn't see a 50v bias tap on that 272dx, this one looks about right
http://www.hammondmfg.com/pdf/EDB372FX.pdf. It's 120$ at mouser

99 bux at angela instruments. i buy some stuff from them. no complaints. 

http://www.angela.com/search.aspx?find=372DX&log=false&category=10


--pete

[sluckey]

Why are you considering another PT? I'd use that Hammond 290Cax that you already have.

[lego4040]

  capacitors/resistors and that damn Ohms Law. I gotta look back in the threads why I was looking(besides alternatives)That's tight Wallibe mentioned that the 6.3 or the 5volt didn't have enough amperage. The ratings for 6.3g and 5v was only 2 amps and it doesn't have a -50 bias tap but this is the ratings in my AllenAmp TP made by Heyboer that's sitting on my shelf if rated at 310V-0-310V @ 150ma, 6.3V at 4.5A, 5V at 2A with a 50v tap, how's that look Steve