Hoffman Princeton Reverb Build #002

[p2pAmps]

Well I had so much fun building the first PR I decided to do a build for buddy of mine who was begging to buy mine (NFS)...

Here it is so far.  This one is going faster as I learned a few things from #001

[plaidzebra]

Ooh, can't wait to see how well this one turns out! Your other build was fantastic

[EL34]

Haaa, finally someone who wires the board first and then adds the parts 


This gives you the added advantage of cleaning off any flux spots after the wiring
And you don't bend the wires on the components by trying to twist wire around a turret that has a part on it already


Looking good so far Mike

[p2pAmps]

Thanks Doug, trying to work smarter and not harder...

[p2pAmps]

Made a little more progress:

[EL34]

Looks great Mike
very clean'

Now is the time to get those flux sprays off the board

[p2pAmps]

Thanks Doug.  I will finish wiring and doing the pots etc, (double check all work twice) clean that board good, and install all the components... 

[EL34]

Nice!

[p2pAmps]

Fast forward

[EL34]

Now that's clean!


Nice work Mike 

[tubeswell]

Very tidy

[p2pAmps]

Thanks Doug, I really appreciate you sir.

Well, the chassis is all done now.  My own personal way I do a QA before I fire it is I check every connection and value and when I am 100% sure I am good I hit it with red lacquer.  I fired it and it worked perfect.  All the voltages are perfect, bias @ 27mA, and even the reverb works this time Doug LOL...  Soon as the cabinet gets here we will have an amp...

Note: I swapped the 1M resistor in the tremolo for a 220K to gain a little more intensity.  I also wrapped the 100K plate load resistors as they were crossing over a ground buss and I got weird about that.  Just my OCD kicking in...

[EL34]

Looks great

Not a bad idea on the plate load resistors that cross above the ground buss.
Whatever makes you feel good about your build

I am not a fan of the red goop, but to each his own on that deal 

[Willabe]

Looks great!   

Why the Mojo .003 cap? I thought Jupiter makes that value.

I am not a fan of the red goop, but to each his own on that deal 

That might be a problem if/when someone goes to change something?

[EL34]

Why the Mojo .003 cap? I thought Jupiter makes that value.

I stock the Jupiter caps now

Don't know if you guys saw the announcement here
http://el34world.com/Forum/index.php?topic=19086.0

[p2pAmps]

Looks great

Not a bad idea on the plate load resistors that cross above the ground buss.
Whatever makes you feel good about your build

I am not a fan of the red goop, but to each his own on that deal 

The red goop is really very thin lacquer Doug and doesn't have any conductivity issues at all. 

[p2pAmps]

Looks great!   

Why the Mojo .003 cap? I thought Jupiter makes that value.

I am not a fan of the red goop, but to each his own on that deal 

That might be a problem if/when someone goes to change something?

I used the vitamin T mojo cap because I had it on hand...

[HotBluePlates]

Another beautiful build!

[sluckey]

Another good job. That's a fancy reverb bag too! 

[SleepLess]

Excellent build! I see you swapped the 1M tremolo resistor for a 220K. Great option, I love that one! Have fun!

[p2pAmps]

Excellent build! I see you swapped the 1M tremolo resistor for a 220K. Great option, I love that one! Have fun!

I did swap the 1M out on #001 too.  It's nice to have the option to get deep intensity if I want or need it.  I rounded up some very nice 6V6s yesterday so I will be giving those a whirl too and see if I hear a difference.  In the meantime my wife has me woodshop-ing for her.  Getting ready to make a Big Green Egg table...

[Willabe]

Oh man, you have a big green egg?

I rrreeeaaaalllllyyyyyy want one of those!!!!!!!!

[p2pAmps]

Oh man, you have a big green egg?

I rrreeeaaaalllllyyyyyy want one of those!!!!!!!!

It's a new addition to the family.  Still in the box waiting for me to build it's nest :)

[eleventeen]

"Still in the box waiting for me to build it's nest :)"


I can't imagine I have to tell you that those things can get incredibly hot...like 800 degrees F. Was just talking with some buds and one of them got one. I couldn't believe the thermometer on it. Yes, they can get fearsome hot, asbestos suit hot.


Glad you added the black Fender back panel overlay on your excellent build. One of them things. Beautiful build, congrats!

[Willabe]

Maybe so but the beauty of big green egg type grills/smokers is that they only need ~ a couple of chimney starters worth of charcoal briquettes to slow smoke a whole brisket or whole pork shoulder, 8 to 12 hours at ~250, instead of 2 to 2 1/2 bags. Not to mention all the running back and forth to check the coils and start a new batch at the right time.


                

[p2pAmps]

"Still in the box waiting for me to build it's nest :)"


I can't imagine I have to tell you that those things can get incredibly hot...like 800 degrees F. Was just talking with some buds and one of them got one. I couldn't believe the thermometer on it. Yes, they can get fearsome hot, asbestos suit hot.


Glad you added the black Fender back panel overlay on your excellent build. One of them things. Beautiful build, congrats!

Yeah they can get very hot but oddly enough mostly on the inside.  You can put your hand on the outside and while you can't leave it there a long time, it will not burn you.  I still have much to discover with the Egg...

[p2pAmps]

All done now

[purpletele]

That is cool!

I bet is sounds great.

[EL34]

Looks great Mike


More sounds clips coming?

[p2pAmps]

Looks great Mike


More sounds clips coming?

Hey thanks Doug...  I am going to have the new owner (My good Bud) make a video when he gets it so we can hear it with his speaker in it.  I still don't know what he will end up using so it will be a surprise to me too. 

[DummyLoad]

I still don't know what he will end up using so it will be a surprise to me too.

jbl d120 or k120! 

very nice build.

--pete

[p2pAmps]

I still don't know what he will end up using so it will be a surprise to me too.

jbl d120 or k120! 

very nice build.

--pete

He is talking about an EV12....  We'll see

[DummyLoad]

I still don't know what he will end up using so it will be a surprise to me too.

jbl d120 or k120! 

very nice build.

--pete

He is talking about an EV12....  We'll see

i love those too. have a cabinet i had custom made loaded with a EV12L and EV15L. still, the JBLs edge it out in my taste preference. the jbl's in decent condition are becoming scarce though, so there's that to contend with. EV 12L are still in production and that's why i lean in the EV direction now.


--pete

[rhodco]

Hey Mike,

I just have a question about your choice for the value of R63 in the Tremolo circuit. I noticed that Doug used 1M in the original example, then commented that it could be altered according to personal preference. You chose to put a 220K in that position for your build. Are you pleased with those results? Would you recommend going any higher or lower in value for that resistor?

Just trying to gather all the knowledge I can from you guys before I order the parts and start building mine.

Thanks,

Cliff

[p2pAmps]

I swapped out that 1M for a 220K to get way more thump.  220K is a little too much now that I did it so I just don't turn it up as far and its fine.  I think a 470K is a good choice too.  Try it out and see what you think, it is kinda personal taste.

Cheers

[rhodco]

I happen to have one of these TO20 output transformers: http://www.allenamps.com/parts.php#transformers

 and I'm wondering how that compares to the Classic Tone 40-18038. Both are spec'd at 6600 to 8 ohms but the Allen seems to be thicker and heavier. My plan is to drive a 12" Weber 12F150T, or Celestion Gold speaker.

 

[p2pAmps]

I happen to have one of these TO20 output transformers: http://www.allenamps.com/parts.php#transformers

 and I'm wondering how that compares to the Classic Tone 40-18038. Both are spec'd at 6600 to 8 ohms but the Allen seems to be thicker and heavier. My plan is to drive a 12" Weber 12F150T, or Celestion Gold speaker.

I am not sure about Allen's OT but word has it they are great.  I just never personally used one as I kinda stay with what I know so far.  I am never opposed to trying new things however.  I bet you can't go wrong with either...

[rhodco]

I've just watched your YouTube video of this amp about 5 or 6 times now - https://www.youtube.com/watch?v=3mb3ig0S11U

I really, really like that tone. You did an amazing job. I'm starting to question my choice of speaker now. That Warehouse G12C/S sounds really good!

[p2pAmps]

So far the Warehouse has been good, a little tight, but it is brand new.  I want to try an Orange Fender D120F for fun.  Did a session a few days ago with PR and it shined bigtime. 

So don't wait, just order the parts from Doug and build yourself one.  Call it a early Birthday/Xmas gift :)

[p2pAmps]

Well, here is the happy new owner and good buddy doing a little demo on PR #002

https://www.youtube.com/watch?v=2OdXeAX6yAw

https://www.youtube.com/watch?v=xhlG1Z6JcwQ

[Fresh_Start]

Too bad your buddy can't play a lick...  Holy cow!



 


Chip