Tube DIY Asylum

take a look at this application document

75.168.143.89

Ralph

In Reply to: RE: Input transformer posted by Oldbean2 on February 07, 2024 at 17:42:17

The values in it suggest that the values you are asking about are incorrect.
JT-11P-1 (Open in New Window)

Follow Ups:

RE: take a look at this application document - Oldbean2 09:28:55 02/08/24 (3)
I'm not sure that the application document you linked is the application I'm using; it appears to take a balanced line feed and convert it to a single unbalanced signal.

The example I copied in my post (linked below from Jensen's site) keeps the balanced signal, with the + side going to one triode and the - to the other - as in my proposed amp. It shows the grid resistor for each triode at 4.99k to ground, for a total of (almost) 10k load on the transformer, matching the 10k secondary of the transformer.

It seems intuitive to me. Or am I completely missing something?

Back for a bit again. Ignore me if you like.
- JT-11P-1 Balanced Tube Line Input Stage (Open in New Window)
- My mistake - Ralph 10:18:41 02/08/24 (2)
  You got it right.
  
  The transformer presents about 13K load to your DAC with the dual 4.99K resistors. I don't know what I was thinking!
  - RE: Whew! Thought I had lost it for a minute - Oldbean2 12:02:19 02/08/24 (1)
    Thank you so much for helping out, I wouldn't have a successful build without it. I'll order a pair of input transformers.
    
    Kinda takes away from the junk box character of the amp, but that's ok, it's something new for me.
    
    Back for a bit again. Ignore me if you like.
    - Yeah, sorry about that. - Ralph 12:09:04 02/08/24 (0)
      Your circuit is similar to the one at the link. You might want to take a look. There is a kit for it IIRC
      http://www.recproaudio.com/diy_pro_audio/diy_files/eqp_1a/eq (Open in New Window)

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