Twin Tweed 5F8-A with Reverb and Tremolo

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Bombacaototal
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Twin Tweed 5F8-A with Reverb and Tremolo

Post by Bombacaototal »

I was thinking of a good way to add a reverb and a tremolo to a 5F8-A. I think the approach taken on the Fender Dual-Professional Custom Shop (schematic attached) may be a good way to go.

One would essentially plug the 5F8-A circuit after the return. There are topology similarities which make me assume this would work. It probably would work on Marshall JTM type circuit too.

Any feedbacks on this approach?
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a j shaner
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Re: Twin Tweed 5F8-A with Reverb and Tremolo

Post by a j shaner »

I have successfully put a passive patch point between the wiper of the treble pot and the entrance to the phase inverter/driver using a Switchcraft 14b jack and TRS Y cord plugged into a tube reverb.
Would probably also work with the ReVibe.
10thTx
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Re: Twin Tweed 5F8-A with Reverb and Tremolo

Post by 10thTx »

What about something like this? It would not be a true Twin Tweed with 5F8-A , but adding reverb and tremolo will change that anyway.

Perhaps this could be a nice sounding amp? I attached an Express SCH editable schematic where you can modify this to whatever you want.

This is a DRAFT idea and you'll need to check for errors.

With respect, 10thtx
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tubeswell
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Re: Twin Tweed 5F8-A with Reverb and Tremolo

Post by tubeswell »

I've put reverb and tremolo into a '5F6A' circuit before. I tried many variations over the course of about 18 months before I arrived at this particular configuration, and this was the most successful. It utilises an Allen Old Flame-style reverb insertion method. The combination of DC coupled pair in front of the tone stack and the reverb and bias-vary trem sound quite good if I say so myself. This could work equally well with a 5F8A circuit methinks (because the topology is almost the same as a 5F6A).
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Bombacaototal
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Re: Twin Tweed 5F8-A with Reverb and Tremolo

Post by Bombacaototal »

Thanks @tubeswell for contributing and for sharing your schematic. It indeed looks like it might sound great. Which model did this tremolo come from?

Thanks 10thtx as well. I love the 6g16 vibrato. Looks like a good idea as well
tubeswell
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Re: Twin Tweed 5F8-A with Reverb and Tremolo

Post by tubeswell »

Bombacaototal wrote: Sat Apr 01, 2017 3:10 am Thanks @tubeswell for contributing and for sharing your schematic. It indeed looks like it might sound great. Which model did this tremolo come from?
It was the bias trem configuration I settled on after several experiments on variants of 6G9/6G11/6G15
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xtian
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Re: Twin Tweed 5F8-A with Reverb and Tremolo

Post by xtian »

tubeswell wrote: Sat Apr 01, 2017 2:26 am I've put reverb and tremolo into a '5F6A' circuit before. I tried many variations over the course of about 18 months before I arrived at this particular configuration, and this was the most successful. It utilises an Allen Old Flame-style reverb insertion method. The combination of DC coupled pair in front of the tone stack and the reverb and bias-vary trem sound quite good if I say so myself. This could work equally well with a 5F8A circuit methinks (because the topology is almost the same as a 5F6A).
That's a very fine schematic, sir. A great distillation of Fenderishness, very nicely documented.
I build and repair tube amps. http://amps.monkeymatic.com
Bombacaototal
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Re: Twin Tweed 5F8-A with Reverb and Tremolo

Post by Bombacaototal »

tubeswell wrote: Sat Apr 01, 2017 3:16 am
Bombacaototal wrote: Sat Apr 01, 2017 3:10 am Thanks @tubeswell for contributing and for sharing your schematic. It indeed looks like it might sound great. Which model did this tremolo come from?
It was the bias trem configuration I settled on after several experiments on variants of 6G9/6G11/6G15
Thanks a lot! I really appreciate the contribution and the well documented schematic as pointed out by xtian

Did you use a fender blackface reverb pan?

This will probably work great for Marshall JTM as well
tubeswell
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Re: Twin Tweed 5F8-A with Reverb and Tremolo

Post by tubeswell »

Yep I used a standard accutronics pan and Fender BF-style reverb transformer.

A JM45 circuit is the same as a 5F6A
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Bombacaototal
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Re: Twin Tweed 5F8-A with Reverb and Tremolo

Post by Bombacaototal »

tubeswell wrote: Sat Apr 01, 2017 5:07 am Yep I used a standard accutronics pan and Fender BF-style reverb transformer.

A JM45 circuit is the same as a 5F6A
Perfect. Thanks again for the generosity!

One more thing, did you create your own layout board? Or did you manage to fit into an existing (ie ab763, princeton)
tubeswell
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Re: Twin Tweed 5F8-A with Reverb and Tremolo

Post by tubeswell »

I did my own layout.
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Bombacaototal
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Re: Twin Tweed 5F8-A with Reverb and Tremolo

Post by Bombacaototal »

tubeswell wrote: Sat Apr 01, 2017 10:34 am I did my own layout.
Noted with thanks
tubeswell
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Re: Twin Tweed 5F8-A with Reverb and Tremolo

Post by tubeswell »

If you want some inspiration for how to lay it out, look at the old flame layout
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davebolden44
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Re: Twin Tweed 5F8-A with Reverb and Tremolo

Post by davebolden44 »

I recently added reverb to my 5f6a bassman clone. I just did a passive loop just like in a dumble, like somebody else said, right between the treble pot and pi. Then I just slapped a plush verbrator in there. It is currently my favorite sounding reverb and amp and I have two ab763s and a traynor reverb master. Cant say enough good about the verbrator, its definitely studio grade reverb. I also think that the fact that the loop comes off a cathode follower is helpful for the quality of the pairing. The unit itself is also a tube buffered loop and trem could be added that way via pedal.
Bombacaototal
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Re: Twin Tweed 5F8-A with Reverb and Tremolo

Post by Bombacaototal »

davebolden44 wrote: Sat Apr 01, 2017 8:01 pm I recently added reverb to my 5f6a bassman clone. I just did a passive loop just like in a dumble, like somebody else said, right between the treble pot and pi. Then I just slapped a plush verbrator in there. It is currently my favorite sounding reverb and amp and I have two ab763s and a traynor reverb master. Cant say enough good about the verbrator, its definitely studio grade reverb. I also think that the fact that the loop comes off a cathode follower is helpful for the quality of the pairing. The unit itself is also a tube buffered loop and trem could be added that way via pedal.
Thanks for the suggestion Dave. I always add the passive loops on my amps and I will check the mentioned unit, although I really love circuits with reverb and tremolo, and will probably go on this route
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