looking for a good trem/ verb unit schematic

[tictac]

I did the more complex Fender harmonic vibrato by adding a 6AT6 for the extra triode needed....

TT

[Two Alpha]

Why? I doubt there will be any difference in the sound.

Part of what's got me going on this is because there did seem to be a difference on the few clips I've heard, an even more three dimensional sound, more "space".

I like the looks of the "A" schematic that uses a CF and a cathodyne phase inverter, but really, the simple paraphrase inverter used in the earlier version sounds very good.

Yes, I think it sounds very good as well.

Who cares how you derive the two modulating signals. They're not in the signal path. The modulator is the same with either circuit and that's what counts.

No, but they're different and their effect on the signal path will be different as well.
Here's the other part of what's got me going on this, the change in the tremolo circuitry was the main difference between the 6G's and the 6G-A's, and Leo changed almost all of the larger amps over to it.
He seemed to have been doing a general tidying up on the schematics as well, but to me, the main improvement he was making was to the tremolo circuit. Not any more complex than the previous one, a little more expensive, he must have thought it was worth it, no?

[Two Alpha]

I did the more complex Fender harmonic vibrato by adding a 6AT6 for the extra triode needed....

Nice, did you build one? If so, how did it work out?

[tubeswell]

Why? I doubt there will be any difference in the sound.

Part of what's got me going on this is because there did seem to be a difference on the few clips I've heard, an even more three dimensional sound, more "space".

I like the looks of the "A" schematic that uses a CF and a cathodyne phase inverter, but really, the simple paraphrase inverter used in the earlier version sounds very good.

Yes, I think it sounds very good as well.

Who cares how you derive the two modulating signals. They're not in the signal path. The modulator is the same with either circuit and that's what counts.

No, but they're different and their effect on the signal path will be different as well.
Here's the other part of what's got me going on this, the change in the tremolo circuitry was the main difference between the 6G's and the 6G-A's, and Leo changed almost all of the larger amps over to it.
He seemed to have been doing a general tidying up on the schematics as well, but to me, the main improvement he was making was to the tremolo circuit. Not any more complex than the previous one, a little more expensive, he must have thought it was worth it, no?

Worth it? The brown amp trems, nice as they are, were an experiment that didn't last long at Fender. By 1964 the AB763 circuits were ubiquitous.

[martin manning]

I have to agree that the later harmonic vibrato circuit was seen as an improvement over the earlier version, but I believe the main reason this effect was discontinued is economic: A 6G4-A has ten tubes, and still no reverb. Reverb was probably considered a must-have by the marketing department, and adding yet another tube plus the driver transformer and delay unit would result in a product that was just too costly to produce.

[Two Alpha]

Worth it? The brown amp trems, nice as they are, were an experiment that didn't last long at Fender. By 1964 the AB763 circuits were ubiquitous.

So you'll be going with the AB763 tremolo in your ReVibe then?

[Two Alpha]

I have to agree that the later harmonic vibrato circuit was seen as an improvement over the earlier version, but I believe the main reason this effect was discontinued is economic: A 6G4-A has ten tubes, and still no reverb. Reverb was probably considered a must-have by the marketing department, and adding yet another tube plus the driver transformer and delay unit would result in a product that was just too costly to produce.

Completely agree with you here, the focus shifted to on board reverb in 1963 and 1964, a single tube tremolo would have to do.

[Two Alpha]

I'm so close to ordering the parts now after obsessing over the various schematics for the past few days.

A few questions....

Markusv, did you and your friend proceed with the ReVibe?

Mr El34, did Tore T come up with his mods earlier than the date shown on the schematic you linked to? It's just that I'm a little surprised by how recent that is.
Also, I've had Espionage on repeat for the last few days, love it!

tictac, would really like to know more about your progress with that schematic/project. The date on there seems like it might be a bit out. What was behind the 22M resistor leading into the intensity pot? I see Leo had a few different values in that position, 4.7M, 8.2M and 10M, there may be more, I didn't check all of them.

Also, I see on another forum where laird mentioned, in reference to the -A version versus the A, that "This circuit is much more stable and less prone to variation due to line voltage or tube strength." Would all you highly experienced folks agree with that?

[EL34]

Mr El34, did Tore T come up with his mods earlier than the date shown on the schematic you linked to? It's just that I'm a little surprised by how recent that is.
Also, I've had Espionage on repeat for the last few days, love it!

Send me the link to the schematic in question so I can check it out

Thanks on the espionage comment
http://el34world.com/Misc/Music/files/Espionage.mp3

[Two Alpha]

This one, knew I should have put the link in there.

http://el34world.com/Hoffman/images/rev ... cToreT.gif

[EL34]

That date is the last date I updated that schematic

Nothing to do with when Tore-T first came up with his mod on my forum

It was shortly after the original Re-Vibe was posted on my forum and that was a very long time ago
I don't remember the exact date when that was

You could probably ask Tore, he is a member on my forum

[Two Alpha]

Thanks for confirming that for me, it's what I thought.

[tictac]

tictac, would really like to know more about your progress with that schematic/project

I built that Revibe about five years ago. It sounded good but I ended up playing more acoustic guitar and sold it.... I've sold lots of stuff I'd like to still have....

I wanted to do the more complex circuit due to getting to work on and play a pair of Blonde Showman back in the 90's and really digging the shimmery vibe of the trem in those amps. Thing is the harmonic vibrato circuit in the showman's is operating at a higher voltage than it is in the Revibe so you lose a bit of the high-end sparkle of the Showman's but it still sounds good even if the oscillation is a bit less intense....

TT

[tictac]

What was behind the 22M resistor leading into the intensity pot?

That's a typo... I actually used a 10M there.....

Here's the layout I used....

TT

[Two Alpha]

Huge thanks for that info and the layout tictac, stayed up until the wee hours last night completing my own express sch schematic so that I could try and finalize a parts order. Lot's of back and forth between your schematic and a few others.
Could one of you enlighten me about the change in the V1-B circuit? An early Gehring revibe schematic, as well as tictac's, are similar to the original 6G15 while all the later schematics have gone to a different configuration.