Please recommend single tube reverb circuit.

[sluckey]

The reverb transformer in a Fender ***STAND-ALONE*** reverb unit is 7K. Same as a champ OT. Much different than the tiny transformer in the reverb circuit of a typical Fender amp.

[tubeswell]

According to the ECL86 datasheet, the anode load resistor of the pentode stage, in class A, should be arround 7k to 10k. I've got 2 NOS Philips ECL86 lying around that should not be used with this transformer correct?

A reverb tranny out of a Fender (stand alone) reverb tank should be close enough to okay for an ECL86 driver.

So then even though the ecl86 wants 7 to 10k and the usual fenders are 15 to 20k, that shouldn't be enough of an impedance mismatch to push the ECL86 too much? How do you know what that threshold is?

A Fender Reverb tank* RT is wound for a 6K6 and is about 5k in the original (IRRC) and maybe 7k-8k in the RIs

*so-named, because its about the same size as your typical old-school aquarium fish tank of the same era, and makes a drippy sound

[pompeiisneaks]

Doh! That's the part I missed, thanks! Makes perfect sense. You guys always rock with the details.

Much appreciated!

~Phil

[turbo5speed]

Ah! Good info right here

Thx.

[turbo5speed]

A reverb tranny out of a Fender (stand alone) reverb tank should be close enough to okay for an ECL86 driver.

Found a schematic for a standalone fender reverb unit model 6G15 that uses the 125A12A transformer with a ratio of 7.5K/8ohms according to a clone that hammond makes(1750AX). Its the second item on this chart: https://www.hammfg.com/electronics/tran ... assic/1750

Now i have options...

[amplifiednation]

Why the 4M7 to ground at the PI entrance? Wouldn’t that just attenuate the entire amp? Or is there a need for a ground reference?

[jam-mill]

Why the 4M7 to ground at the PI entrance? Wouldn’t that just attenuate the entire amp? Or is there a need for a ground reference?

Probably comes from here: https://ampgarage.com/forum/viewtopic.p ... 347#p11365