Type 50 Tube Amp

[jhstewart9]

My last post was to be in the 6AS7G thread. Oh well!!😀
More over there for anyone interested.

 

[disco]

I'm listening to this one right now. My daily driver since 2014.

Is the TR-91 a stepup transformer?

 

[jhstewart9]

Looks like stepup to me. I think the label LHS is probably saying 50/200 Ohms, the RHS to a grid, HI-Z. And an internal shield. A Mike to line transformer maybe?🙂

 

[rkoonce]

Is the TR-91 a stepup transformer?

Yes, it's wired for maximum voltage gain. It's a microphone transformer.

 

[Bigun]

Looking for other examples ? Sakuma used the type 50 in a number of his various amplifiers, for example: May. 1979

p.s. Hammond iron is good, it’s better than some folk seem to think.

 

[jhstewart9]

Hammond 800 Series Broadcast Quality

This was the Hammond 800 Series in Year 2000, quite a bit fewer than in the 50s & 60s.The H808 is similar to the Newcomb TR-91.
I've got an H806 in my pile. But apps for that one are very limited.🙂

 

[disco]

Looking for other examples ?

Thank you. At the moment I am exploring my options with either a two way setup using a high-Gm penthode like 12HL7, C3G or a three way "antique" setup. The driver will load a 10K interstage (BW>48KHz) and couple into the 50, loaded by a Tango XE-20S.
Another option is the semiconductor route. Probably Ale's board is a good candidate for squeezing out driver stage distortion.