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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

Replacing valves.
Replacing valves.
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Old 15th April 2019, 12:24 PM   #31
kodabmx is online now kodabmx  Canada
Affordable triode connected sweep tube amps.
diyAudio Member
Join Date: Oct 2011
Location: Toronto
Replacing valves.
No difference really... The grid is still grounded in the first one albeit through a 100k resistor. This resister along with another and a cap can be used for Broskies' Aikido PS noise nulling. I removed it since I don't use Aikidoing.
I find this circuit will work from about 200V to 350V without changes but the higher end of the voltage scale is preferred if you have it. The above example using 280V is based on an eBay 12V to 280V DC boost converter.

I've also changed the 1M on the output to 100k.

Last edited by kodabmx; 15th April 2019 at 12:27 PM.
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Old 16th April 2019, 09:09 AM   #32
Boydk is offline Boydk  Denmark
diyAudio Member
Join Date: Feb 2010
Location: Aarhus, Denmark
Thanks BearBMX
Valuable info. I bought a bunch of these boost converters (ideal price), so
Im going to give this a GO in the near future.
Thanks again for all your info
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