Marshall SV20

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Re: Marshall SV20

Post by Optical »

Marshall tsl has a fender clean channel. Underrated amp

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Re: Marshall SV20

Post by blackstratblues »



A good look at the insides here..

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Re: Marshall SV20

Post by jeremyb »

blackstratblues wrote: Sun Jan 16, 2022 10:34 pm

A good look at the insides here..
Thanks for the link, his origin 20 mods make it sound awesome!
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Re: Marshall SV20

Post by MikeC »

Those SV20s sound great! I'm thinking hard about building a 20W cathode biased Marshall Plexi style head using the Trinity Custom Plexi 6V6 circuit. I'll include power scaling so output will be infinitely variable between about 3 watts - Max watts. Haven't built anything for a little while!

What do you think? https://www.youtube.com/watch?v=zCFTU6K_J4E
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Re: Marshall SV20

Post by Cdog »

MikeC wrote: Mon Jan 17, 2022 8:05 am Those SV20s sound great! I'm thinking hard about building a 20W cathode biased Marshall Plexi style head using the Trinity Custom Plexi 6V6 circuit. I'll include power scaling so output will be infinitely variable between about 3 watts - Max watts. Haven't built anything for a little while!

What do you think? https://www.youtube.com/watch?v=zCFTU6K_J4E
My trinity kit was the Plexi 6v6 version. With VVR on the B+. Sounds great 😎

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Re: Marshall SV20

Post by MikeC »

Cdog wrote: Mon Jan 17, 2022 4:00 pm
MikeC wrote: Mon Jan 17, 2022 8:05 am Those SV20s sound great! I'm thinking hard about building a 20W cathode biased Marshall Plexi style head using the Trinity Custom Plexi 6V6 circuit. I'll include power scaling so output will be infinitely variable between about 3 watts - Max watts. Haven't built anything for a little while!

What do you think? https://www.youtube.com/watch?v=zCFTU6K_J4E
My trinity kit was the Plexi 6v6 version. With VVR on the B+. Sounds great 😎
That's good to know. Did you power scale the entire amp or just the power stage?
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Re: Marshall SV20

Post by Cdog »

MikeC wrote: Mon Jan 17, 2022 5:39 pm
Cdog wrote: Mon Jan 17, 2022 4:00 pm
MikeC wrote: Mon Jan 17, 2022 8:05 am Those SV20s sound great! I'm thinking hard about building a 20W cathode biased Marshall Plexi style head using the Trinity Custom Plexi 6V6 circuit. I'll include power scaling so output will be infinitely variable between about 3 watts - Max watts. Haven't built anything for a little while!

What do you think? https://www.youtube.com/watch?v=zCFTU6K_J4E
My trinity kit was the Plexi 6v6 version. With VVR on the B+. Sounds great 😎
That's good to know. Did you power scale the entire amp or just the power stage?
I installed it as recommended, scaling the whole amp... it sounds good at any setting. No need for a MV :)

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Re: Marshall SV20

Post by vinylguy »

Blackface princeton and a Marshall Guvnor works for me ?

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Re: Marshall SV20

Post by FuzzMonkey »

I'd love it if it was a hand-wired turretboard inside the SV20 head rather than an PCB.
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Re: Marshall SV20

Post by rickenbackerkid »

That would be nice, specially because these things aren't cheap at nearly $2K for the combo, but for me the proof is in the sound, and I think the SV20 sounds great. The circuit and PCB design works just fine.

If you want a hardwired equivalent, one of the plexi kit amps could probably be built to SV20 spec. I can't find a schematic right now but I'm pretty sure I saw one at one time and lower output at 20 and 5 watts was done by undervolting the el34 plates along with cathode bias. That should be a fairly simple mod to a plexi build

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Re: Marshall SV20

Post by FuzzMonkey »

rickenbackerkid wrote: Tue Jan 18, 2022 12:39 pm That would be nice, specially because these things aren't cheap at nearly $2K for the combo, but for me the proof is in the sound, and I think the SV20 sounds great. The circuit and PCB design works just fine.

If you want a hardwired equivalent, one of the plexi kit amps could probably be built to SV20 spec. I can't find a schematic right now but I'm pretty sure I saw one at one time and lower output at 20 and 5 watts was done by undervolting the el34 plates along with cathode bias. That should be a fairly simple mod to a plexi build
I agree. The tone is king first and foremost.
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Re: Marshall SV20

Post by goldtop0 »

I'm looking around for a SV20H head if anyone knows of one for sale anywhere.
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Re: Marshall SV20

Post by MikeC »

See my earlier posts on this thread but I was interested in the SV20 too. I ending up building a Trinity Custom Plexi 6V6 with Global Power Scaling - refer https://www.trinityamps.com/product/trinity-18/ (scroll down to Custom Plexi for the description). I can build you one or I'd consider selling mine (and building another). I've got the Trinity schematic and build them from scratch.
Head Cab Front.jpg
Head Cab Front.jpg (2.24 MiB) Viewed 1544 times
Trinity Custom Plexi Chassis Topside.jpg
Trinity Custom Plexi Chassis Topside.jpg (2 MiB) Viewed 1544 times
Trinity Custom Plexi Gutshot.jpg
Trinity Custom Plexi Gutshot.jpg (2.64 MiB) Viewed 1544 times
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Re: Marshall SV20

Post by MikeC »

Oooh Mr Mcnoleg, you look handsome in green!
Last edited by MikeC on Thu Oct 13, 2022 2:38 pm, edited 1 time in total.
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Re: Marshall SV20

Post by sizzlingbadger »

Looks great Mike, I'd like one with an FX loop at some stage. I really should get off my ass and build one myself.
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