JJ 6V6 with Deluxe Reverb

[Bombacaototal]

6V6 usually run 425V but the JJ 6V6 run at 450V (spec sheet attached).

Given the tremolo circuit uses C- voltage I am wondering what would be the correct work around to get the voltage correct?

[Stevem]

Your wasting your times chasing this as it's a non issue!

DR amps have come right from the factory fitted with either 5AR4 rectifiers , or 5U4 rectifiers and the 5AR4 recto being a low impedance type will pump out some 22 more volts of DC into the amp !

The same power transformer was used with both types of rectifiers!

[Bombacaototal]

Your wasting your times chasing this as it's a non issue!

DR amps have come right from the factory fitted with either 5AR4 rectifiers , or 5U4 rectifiers and the 5AR4 recto being a low impedance type will pump out some 22 more volts of DC into the amp !

The same power transformer was used with both types of rectifiers!

Hi Stevem, thanks for the reply. Appologies but I did not explain well. I have a solid state rectifier and 220uF supply caps, like SRV mods to the Vibroverb. And I also have an oversized Vibroverb OT (like Cesar Diaz used to do..)

But maybe I am overthinking as you pointed out..

[sluckey]

6V6 usually run 425V but the JJ 6V6 run at 450V (spec sheet attached).

Given the tremolo circuit uses C- voltage I am wondering what would be the correct work around to get the voltage correct?

I still don't understand your question. The only time the C- voltage is used in the tremolo circuit is when the tremolo is switched off. Then the negative voltage insures the oscillator and driver triodes are biased to hard cutoff. When you turn the footswitch on the negative bias voltage on the grids of the trem tube is killed (grids go to zero volts). This sudden change from hard cutoff to on condition shocks the oscillator into operation. This gives a quick start for the tremolo effect. This operation has nothing to do with the 6V6 tubes.

So, if I'm totally missing your point, can you restate your question?

[Bombacaototal]

6V6 usually run 425V but the JJ 6V6 run at 450V (spec sheet attached).

Given the tremolo circuit uses C- voltage I am wondering what would be the correct work around to get the voltage correct?

I still don't understand your question. The only time the C- voltage is used in the tremolo circuit is when the tremolo is switched off. Then the negative voltage insures the oscillator and driver triodes are biased to hard cutoff. When you turn the footswitch on the negative bias voltage on the grids of the trem tube is killed (grids go to zero volts). This sudden change from hard cutoff to on condition shocks the oscillator into operation. This gives a quick start for the tremolo effect. This operation has nothing to do with the 6V6 tubes.

So, if I'm totally missing your point, can you restate your question?

Thanks Sluckey. That clarifies...and thanks for the detailed explanation. It was my misunderstanding of the C- function at the circuit. Apologies

[Stevem]

With that SS recto you had better watch out how much D.C your hitting those power supply filters with, especially those first 2 filters before the standby switch with the switch in standby and no load on the power supply!

[Bombacaototal]

With that SS recto you had better watch out how much D.C your hitting those power supply filters with, especially those first 2 filters before the standby switch with the switch in standby and no load on the power supply!

Thanks Stevem, I appreciate the input.

[Bombacaototal]

Just deviating a bit from original question...has anyone tried 5881 power tubes on a Deluxe Reverb at around 30ma per tube?

I am mostly worried if the PT handle it? The supply caps are 20uF /475V and the power supply cap 220uF / 350V. Vibroverb OT, SS rectifier and these should be fine. Or maybe best to stick to the JJ 6V6?

[pompeiisneaks]

I haven't' but I was under the impression the 5881 is almost a direct swap for 6L6 and therefore would probably push the limits of the transformer for 6V6's.

[Bombacaototal]

Feom what I was reading it is like a 6L6 GB which is slightly lower than the GC, but still a 6L6

[Colossal]

For what it's worth, I've run JJ 6V6S at 440V, even 460V on the plates (screens were about 80V lower, IIRC). I used a Vibroverb PT and a 20W Marshall OT for a 6V6 Plexi. The tubes held up just fine. They stopped sounding good after about a year of abuse, but never failed.

[Bombacaototal]

For what it's worth, I've run JJ 6V6S at 440V, even 460V on the plates (screens were about 80V lower, IIRC). I used a Vibroverb PT and a 20W Marshall OT for a 6V6 Plexi. The tubes held up just fine. They stopped sounding good after about a year of abuse, but never failed.

Thanks for the feedback colossal. Probably best to stick to the JJ 6V6.

[ChopSauce]

Just deviating a bit from original question...has anyone tried 5881 power tubes on a Deluxe Reverb at around 30ma per tube?

I am mostly worried if the PT handle it? The supply caps are 20uF /475V and the power supply cap 220uF / 350V. Vibroverb OT, SS rectifier and these should be fine. Or maybe best to stick to the JJ 6V6?

May https://ampgarage.com/forum/viewtopic.php?f=8&t=30858 help ?

[Bombacaototal]

Thanks chop! It is encouraging that both Neil Young and Jerry used 6L6s on a Deluxe. Although the PT on the vintage amps were very sturdy. Will the reissue PT be as such?

Another thing that occurred to me by reading the other thread is the 1W 100k plates. Mine are all 1/2W new production Dale. Any risks here?

These are my transformers

[sluckey]

Thanks chop! It is encouraging that both Neil Young and Jerry used 6L6s on a Deluxe. Although the PT on the vintage amps were very sturdy. Will the reissue PT be as such?

Another thing that occurred to me by reading the other thread is the 1W 100k plates. Mine are all 1/2W new production Dale. Any risks here?

These are my transformers

1/2W is fine. They are only running at about .1W. Many people like to replace the original Fender 1/2W CC plate resistors with 1 watt resistors because they are less likely to produce that bacon frying sound, not because of power concerns.