Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: DummyLoad on September 17, 2011, 04:27:45 pm

Title: 6J6A Long Tail Phase Inverter.
Post by: DummyLoad on September 17, 2011, 04:27:45 pm

any ever try using a 6J6 for a long tail? would any of you even consider it?

here's what i was thinking...

75K Ra1
91K Ra2
1K2 Rk
10K Rtail
1K   Rtail-nfb
RNFB - to taste...
about 3mA bias sitting around -4Vgk.
should make about 70Vpk into 220K loads.

thoughts?

thanks in advance for any input.

peace.

--DL

Title: Re: 6J6A Long Tail Phase Inverter.
Post by: DummyLoad on September 17, 2011, 08:18:11 pm

never mind.

tube does not sound good for guitar amp use - maybe in hi-fi it would find a better home. tried a wide range of bias points and i liked none of the tone. reverting to the 6AV6 cathodyne.

peace.

--DL

Title: Re: 6J6A Long Tail Phase Inverter.
Post by: Tiny_Daddy on September 17, 2011, 08:45:17 pm

Also notice the 6J6 draws the same filament current as a 6V6 power tube.

Title: Re: 6J6A Long Tail Phase Inverter.
Post by: DummyLoad on September 17, 2011, 09:39:45 pm

Also notice the 6J6 draws the same filament current as a 6V6 power tube.

9W tube - should draw some fil. current. 6SN7 draws even more - 600mA, i doubt that's only reason it hasn't worked out well for me for guitar amp use.