What to build with a Baldwin 512-025947 OT(Matchless Clubman)

[frankenxtein]

Modified the Master Volume and added a handle and a little decoration. Note the Brilliant control is before the Master volume now. The amp has a real glassy sound and is much better at doing overdrive at lower volumes.
The effects loop is so quiet , I want to use this preamp on a couple other builds with , different power sections. Maybe a EL84 and a 12bh7 Micro Clubman.
The power supply is modified from my original build.
Stiffened up a bit , the first two nodes are 41uF (stacked 82uF 400v caps) then a 47uF 450v , then 33uF on the next two , last is a 22uF.
 Hopefully I'll get a a couple YouTube video links up pretty soon.

The labels are done with a woodburner

[bmccowan]

Love the wood burner approach. Brings back memories. My folks gave me a wood burning kit when I was 7. I wish I had saved the signs I made. I did save the scar on my arm - still visible after 61 years. They were lucky I did not burn the house down.
Anyways after building my 6V6 Clubman, I used that basic preamp for a couple of alternate builds: a single ended 6L6 from an 8W Bogen PA, and a PP 6BM8 using a Hammond AO-39 chassis. Both projects worked out well. The pentode for the Bogen is a 6SJ7, and for the 6BM8 amp a 5879. Tubenit has drawn up some interesting schematics with the 5879 in the V2 position, and if you build something similar to his schematics he is really helpful during the process.

[valvetones]

Just slinging together a few things to build another monstrosity. 

I haven't got a schematic worked up yet but , hoping to use the Baldwin output transformer from a organ amp.

Parts:
Thordarson 26r46 - 370-0-370vac 190mA 5volt 3A two 6.3volt taps 7.9A & 1.2A It is in the 1966 catalog. Weighs over 11lbs

Baldwin OT 512-025947 -  20:1 ratio 3440k with a 8 ohm load 3.5" tall 3" wide 3.5" bell to bell , about 3lbs. (used 4 el84' PPP) I don't have a schematic of the Baldwin 46H but , they could have been using it at 4 ohms. So a 16 ohm load is probably not a good thing. What I've read it's a 40watt OT but I'm not trying to hit a certain output.

Baldwin Choke B512-024873A .... 8H 169 ohms (if needed)
1- 5u4gb RCA
2- el34 Shuguang

I was hoping to put a Bassman style preamp on the front of a power amp made with the above parts?
        I realize the PT has a bit more voltage than required by a Matchless Chieftain. That design is a bit more complicated than I had in mind. Any suggestions on a cathode bias design , that would fit the iron would be appreciated.

Thordarson Transformers are AWESOME.
Let me know if you want a matching thordarson output transformer as well.
I have about 20 of them.

[frankenxtein]

 My ef86 is actually a 6Ж32П (6J32P) The other two I just got , are the same. I didn't adjust the circuit not sure if makes a big difference.
I'm not really too sharp on the finer points , although I really enjoy putting these things together.
Sure have learned more about tube amps trying to get cleaner sound out of them.
The community here has helped me so much.

I ordered that 6Ж32П because it said ef86 , when I was told the 6sh7 tube they used in that position wasn't a real good thing.

I was wanting to label the controls and the I/O jacks on the amp and got carried away with that woodburner. 
I bought it just for a extra soldering iron , before they closed the Sears store here in Memphis. This it the first time I've used it.
I have a few amps I built that I don't know what the controls are. LOL
I build em and set em on a shelf.
This is a amp my son can gig with. 

[frankenxtein]

Just slinging together a few things to build another monstrosity. 

I haven't got a schematic worked up yet but , hoping to use the Baldwin output transformer from a organ amp.

Parts:
Thordarson 26r46 - 370-0-370vac 190mA 5volt 3A two 6.3volt taps 7.9A & 1.2A It is in the 1966 catalog. Weighs over 11lbs

Baldwin OT 512-025947 -  20:1 ratio 3440k with a 8 ohm load 3.5" tall 3" wide 3.5" bell to bell , about 3lbs. (used 4 el84' PPP) I don't have a schematic of the Baldwin 46H but , they could have been using it at 4 ohms. So a 16 ohm load is probably not a good thing. What I've read it's a 40watt OT but I'm not trying to hit a certain output.

Baldwin Choke B512-024873A .... 8H 169 ohms (if needed)
1- 5u4gb RCA
2- el34 Shuguang

I was hoping to put a Bassman style preamp on the front of a power amp made with the above parts?
        I realize the PT has a bit more voltage than required by a Matchless Chieftain. That design is a bit more complicated than I had in mind. Any suggestions on a cathode bias design , that would fit the iron would be appreciated.

Thordarson Transformers are AWESOME.
Let me know if you want a matching thordarson output transformer as well.
I have about 20 of them.

Appreciate that , I have so many transformers and tubes , I could build another one of these MC 35's. I get distracted so easily , I'm supposed to be building a Matchless Spitfire and have the parts all laid out.
Made myself a little breadboard setup and haven't been able to get back to it.
Then I get "can you put piezo's in my Viola ?"
"My car won't start" , stay away from VW Jetta's Still have to do the rear brakes after a alternator and a front wheel bearing. When someone says we need to remove the front/nose of the car to replace the washer fluid tank. It's true 
I have some cool toys to play with and don't get the time.

[bmccowan]

when I was told the 6sh7 tube they used in that position wasn't a real good thing

Yup - I was told that when I planned to use that tube in my Clubman.

They are all microphonic

was the common claim. But I have heard that repeatedly about 6SJ7 and 5879 tubes also. The proof they point to is that if you tap them with a pencil or chopstick they make a noise that comes through the speaker. The solution to this is simple; stop tapping your tubes with pencils and chopsticks.
I had two 6SH7s - both worked fine in the circuit. 

[valvetones]

“ The solution to this is simple; stop tapping your tubes with pencils and chopsticks.”

  LMAO

FINALLY!!! I’m getting sick of all these you tubers tapping tubes with pencils and FALSELY claiming they are bad tubes because they are microphonic .
If that’s the case, then all tubes are no good, and we should throw away all this junk and go to solid state.
But I digress,  all tubes are microphonic to some degree, it’s when the amp rings uncontrollably due to vibration that makes a tube not worth using.

[frankenxtein]

I had been given a couple two headed eraser pencils a long time ago.
At a Oil Show in Odessa ?   
Tube Tappers 

I thought tapping on tubes was the way you could tell if they were working. 

I've had good luck shoehorning stuff together but , I listen to and often heed advice given here. 

[PRR]

I had been given a couple two headed eraser pencils a long time ago.
At a Oil Show in Odessa ?   
Tube Tappers  ....

OMG. I thot you were blowing smoke up our skirts but:

https://www.hammermuseum.org/hammer-highlight-tube-tapper

Not, apparently, for microphonics (which are inevitable) but for intermittents  (a fault).

[shooter]

 
my pocket protector is already FULL, but that's a cool tool!

[bmccowan]

The Hammer Museum! Another place to add to my bucket list.

[PRR]

Tube Tappers for sale in 1951. You could write with it! And now discovers microphonism.

[sluckey]

PRR, do you have a time machine? If so, I'm coming for a visit...   

[PRR]

PRR, do you have a time machine?

Today's stop, 1948, featuring Hytron Handy Tube Tapper.