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Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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Old 12th June 2018, 08:14 PM   #191
kodabmx is offline kodabmx  Canada
diyAudio Member
Join Date: Oct 2011
Location: Toronto
You're welcome, Chris. I'm guessing it's unity. The tone circuit itself is a 20db insertion loss, though. Perhaps you can calculate the gain of the surrounding tube stages?
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Old 12th June 2018, 08:18 PM   #192
hendrixgr is offline hendrixgr
diyAudio Member
Join Date: Apr 2018
I can, no problem! Tomorrow i will decide what to build as now i have new information and options.
Thank you again!
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Old 23rd June 2018, 10:26 AM   #193
hendrixgr is offline hendrixgr
diyAudio Member
Join Date: Apr 2018
Just ordered some pcb for the PI only, the NFB circuit is enhanced and it works fine with the LED bias.
When i finish and test everything i will post the relevant files.
The Tone stack is not the final design, obviously some cleanup is needed.
Attached Images
File Type: png pi_pcb.png (139.1 KB, 28 views)
File Type: png James_tone_stack_pcb.png (145.3 KB, 24 views)

Last edited by hendrixgr; 23rd June 2018 at 10:31 AM. Reason: more information
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