Pleximan Tremoverb...update with layout

[Lynxtrap]

This is a schematic for basically a tweed bassman, with a second channel with some "plexi" twists. It has added tremolo (blonde type) and reverb (blackface type).

Comments on the whole circuit would be much appreciated! B+, tremolo and reverb sections especially, since much of the rest is basically copy-paste.
Every suggestion is welcome

Sorry if it's hard to read, I don't know how to draw schematics on the computer...

[10thTx]

Here is something similar that I had drawn some time ago.

I may have the SCH editable version somewhere also?

With respect, 10thtx

[jjman]

Lots a fuses! I would not fuse the bias supply.

[Lynxtrap]

Here is something similar that I had drawn some time ago.

I may have the SCH editable version somewhere also?

With respect, 10thtx

Oh you did that? I looked at that schematic a lot, and used some ideas from it as you may see. One is sending and inserting the reverb on each side of a resistor.
It really started with me wanting to learn more about reverb circuits, so it's a learning process. Somebody tipped me off to your schematic. I think it was in another thread I started that got moved to the Fender section.
(I thought since this isn't really a Fender topic, I'd post my schematic here).

I ended up not using that particular reverb because I wasn't sure how far one triode would go in drive position. I opted to go for a more typical blackface circuit, as a safe bet. How would you compare your solution to the traditional Fender reverb, soundwise?
Is 100K enough for the resistor between input and output?

As to the fuses, it might be a bit over the top. I was looking a lot at O'Connor's schematics in TUT3 when I drew that, didn't give it much thought at the moment.

[10thTx]

How would you compare your solution to the traditional Fender reverb, soundwise?

I have owned and played some great vintage Fender amps. And I prefer the one tube reverb. It seems to verb more mid tones, IMO.

It won't do "surf reverb". Having said that, I always had the 1M dwell pot set to "5" and the 1M reverb pot set to "3". And that gave me all the reverb I needed with more left on tap. I originally built it with the 2.2M reverb pot and removed it because there was too much reverb for me.

The 100k mixing resistor works fine for me. I've also used 150k. Remember the 1M reverb pot adds to the "separation" more than the 100k Fender pot would.

On the Hoffman EL34 world forum, there is a guy going by Tubeswell from New Zealand that did a Bassman with reverb and vibrato a few yrs ago. He did more of a traditional Fender reverb on his.

With respect, 10thtx

[10thTx]

OK, I found Tubeswell's Bassman with reverb and tremolo. He did that in 2010.

Here is the link (complete with soundclips):

http://www.el34world.com/Forum/index.php?topic=10701.0

With respect, 10thtx

[Lynxtrap]

OK, I found Tubeswell's Bassman with reverb and tremolo. He did that in 2010.

With respect, 10thtx

Thanks, I'll have a closer look at that! It's always good with input from different sources for inspiration and knowledge.

I'd hesitate to put the signal through the extra gain stage after the cathode follower tonestack, but maybe it doesn't matter much?
My basic thought was to keep the main signal path as closely to the 5F6B as possible.
And that 3.3M/10pf... Is that really necessary or does it come out of old habit?

As I sidenote, I don't understand how the voltage readings at the input stages can be that different...

[10thTx]

As I sidenote, I don't understand how the voltage readings at the input stages can be that different...

Please keep in mind that a 12AX7, 5751, 12AY7 are all going to have different plate voltages in the EXACT same circuit. And in this example from higher to lower plate voltages.

In my amps, I typically will measure several different tubes in V1 for example. However, I typically use 12AX7 tubes as my reference point.

Hope that makes sense to you?

With respect, 10thtx

[Lynxtrap]

Please keep in mind that a 12AX7, 5751, 12AY7 are all going to have different plate voltages in the EXACT same circuit. And in this example from higher to lower plate voltages.

In my amps, I typically will measure several different tubes in V1 for example. However, I typically use 12AX7 tubes as my reference point.

Hope that makes sense to you?

With respect, 10thtx

Of course, but I was looking at the readings between the two halves of the first AY7. They are fed from the same point, with 100k plate resistors and 1.5k at the cathode.

[10thTx]

I was looking at the readings between the two halves of the first AY7

Ah, see it now. I'm guessing that was simply a typo mistake?

With respect, 10thtx[/quote]

[Lynxtrap]

Going back to my drawing, do you see anything there that simply won't work or absolutely should be different?

I will probably not go with that master volume, so you can ignore that.

[Lynxtrap]

Lots a fuses! I would not fuse the bias supply.

I just realised why. I'll leave that one out for sure.

[tubeswell]

I built a tweed bassman with reverb and tremolo a couple of years ago - sounded quite good in this configuration FWIW

[img724]http://farm9.staticflickr.com/8366/8446 ... a262_b.jpg[/img]

Soundbyte with Strat and 2 Greenback G12M

http://music-electronics-forum.com/atta ... ry-man.mp3

[Lynxtrap]

I built a tweed bassman with reverb and tremolo a couple of years ago - sounded quite good in this configuration FWIW

Thanks, if you read the whole thread you might find some quenstions for you!

[10thTx]

do you see anything there that simply won't work or absolutely should be different

I think the .002 going into the grid of the 12AT7 (reverb) will be too high of a value. I'd try .001, 820p, 680p or 500p. I typically use .001.

With respect, 10thtx