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ECC99 Reverb Driver
ECC99 Reverb Driver
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Old 15th November 2019, 10:52 AM   #1
Seabstudio is offline Seabstudio
diyAudio Member
Join Date: Nov 2019
Default ECC99 Reverb Driver

Greetings !

I already build a standalone spring reverb with a transformeless driver for tank for a studio use so unit use balanced transformer for input and output ( connect to a +4dbu mixing desk )

It work good, but I want to drive more the tank and don't know witch values I need to tweak arround the Tube to test

I follow the Valve Wizard recommandation but originally he drawn shematic for ECC82 , but say " A larger triode like an ECC99 or even a triode-strapped pentode might be used on its own "


But I think values can be ajusted ...if someone can help
Thanks in advance


The Valve Wizard
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Old 15th November 2019, 08:09 PM   #2
Alllensoncanon is offline Alllensoncanon  United States
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Join Date: Mar 2017
Location: NorCal, East Bay
ECC99 Reverb Driver
If you use 1/2 of an ECC99 to replace the parallel ECC82 in this circuit, try change Ra from 22K to 12K. Rk from 820R to 550R.That should increase the plate current from ~7mA to ~10.5mA.
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Old 17th November 2019, 11:58 AM   #3
Seabstudio is offline Seabstudio
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Join Date: Nov 2019
Thanks a lot for this suggestion !
I can't use the parallel ECC99 to drive the tank ?
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