Supro Clones

Contemporary amp builders and manufacturers.

Supro Clones

Postby Demo on Fri Jan 23, 2009 5:27 pm

As a fan, I'm just curious as to why nobody picked up on any of the variants of the Supro/National/Gretsch/etc designs and cloned them? I guess, in a way, Mark Baier (Victoria Amps) is with his clones a couple of Gretsch Amps. But the one I'm thinking of uses EL84's (Baier's version) in stead of the 6973's that I think were in the originals.

Notwithstanding the Zep hype, those were some very cool sounding amps. I especially like some of the many 1624 (Model 24) variants (probably not what Page used). Still THE only amp I have ever owned that I liked equally with HB's and SC's.

This is weird starting a thread on a new website where there are practically no others to get lost among? It's almost compelling to write something inspiring or controversial. I got nothing.
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Re: Supro Clones

Postby 57lpjr on Fri Jan 23, 2009 6:10 pm

I think it's mostly related to the cost of many of the originals still being low enough to afford, and plentiful enough, to make most builders look towards the more Fender / Marshall / Vox realm. The late '50's Gibson's are starting to appreciate and now there are some clones of them - I think Victoria is doing a GA40 style...down the road we'll see more especially with the connection between the circuits of Valco / Gibson / Vox in the new Vox book...
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Re: Supro Clones

Postby Butterylicious-V2.0 on Sun Jan 25, 2009 5:37 am

I built a Thunderbolt clone on my breadboard. 1 trick pony, but it does do that 1 trick very well. Ran several experiments: parallel input tube (that was the best one actually), 12BZ7 front end, EF86 OD, reverb circuit..... meh. It was a cheap amp that happens to sound really cool when dimed. BTW there's some erroneous schematics floating around for the T-bolt.
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Re: Supro Clones

Postby tracynorton on Tue Jan 27, 2009 7:13 pm

I built this for a guy
http://627041283590969950-a-18027447737 ... OLT-HG.pdf

used original Valco 25:1 OT and all ceramic caps and Tung-Sol 5881s.....comments from different people were the same...
'...sounds like the best JTM45 I ever heard...'
wierd, but true
it is a one trick pony, tho
i was going to build one for myself....but I don't like jimmy page....so why bother
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Re: Supro Clones

Postby Butterylicious-V2.0 on Wed Jan 28, 2009 8:08 pm

Luvs yer suppository. :P

Here's the schematic for the Thunderbolt Hybrid I prototyped.
http://www.butterylicious.com/Schematic ... d-R1.2.pdf
This is a modified circuit and should not be assumed or considered an actual Thunderbolt. All the schematics I've seen floating around show a ss rectifier. The one I laid paws on had a 5U4GB rectifier. The theory about Valco is that they were perpetually changing their circuitry based upon parts they had on hand while building for Monkey Wards. Watch out for erroneous Thunderbird schematics. There's several floating around with the paraphase drawn wrong. It has the cathode resistors reversed and the wrong triode bypassed. I've read it argued that this was done to throw the outputs out of balance to give it "that" sound. I disagree. "That" sound comes from the speaker. I do have an old Jensen 15" alnico speaker in my lab and this thang grunged up real good through that speaker. The fundamental changes from the original circuit are:

Tube rectifier
V1 tube and circuitry
pilot lamp
grounding
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Re: Supro Clones

Postby tracynorton on Thu Jan 29, 2009 2:38 am

yea, they must have
the guy I built that one for had two identical SS rect Thunderbolts I rev eng....PI is unbypassed...the pre filter cap was a .1uF...OT s are 5k@8ohms
I'd love to get ahold of an original tube rect (unmolested) to see what the original circuit was
I do like the sound of them thru G12H30s...but again...they do that one thing, and that's about it
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Re: Supro Clones

Postby piperbob on Fri May 29, 2009 4:14 am

I recently built one of these little fella's: http://www.turretboards.com/guitar_ampl ... el_24.html Nice sound with an alnico 12" in the cabinet. Those 6973 power tubes have a nice charactor to them. This circuit has a nice sounding tremolo too. I think Weber is about to come out with a Supro clone kit soon, Some pix of an original Supro:
http://www.turretboards.com/images/s6424_photo_4.jpg
http://www.turretboards.com/images/s6424_photo_5.jpg
http://www.turretboards.com/images/s6424_photo_6.jpg
http://www.turretboards.com/images/s6424_photo_7.jpg
http://www.turretboards.com/images/s6424_photo_3.jpg
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Re: Supro Clones

Postby moritz on Sat May 30, 2009 3:38 pm

piperbob wrote:I recently built one of these little fella's: http://www.turretboards.com/guitar_ampl ... el_24.html Nice sound with an alnico 12" in the cabinet. Those 6973 power tubes have a nice charactor to them. This circuit has a nice sounding tremolo too. I think Weber is about to come out with a Supro clone kit soon, Some pix of an original Supro:


Nice! I plan to build a Supro model 1624 too... lovely little amps! There are a few build reports around the net of the turretboards.com kit, and by all accounts, it's a very good amp. I plan to build from scratch using a bunch of parts I already have lying around, with a few still to be aquired. I'm curious, do you know what the voltage output is on the secondary of your power transformer (before the rectifier that is)?
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Re: Supro Clones

Postby piperbob on Sat May 30, 2009 4:35 pm

Moritz wrote: I'm curious, do you know what the voltage output is on the secondary of your power transformer (before the rectifier that is)?

Off hand I don't know. The amp is about 5 feet from me but all buttoned up. I had to wrestle with 8 cabinet screws to install the back panel :? Don't look forward to any mods or measurements soon! You might email turretboards and ask. The power transformer is a Heyboer. Here is the schematic: http://www.turretboards.com/Supro%20kit ... ematic.pdf . The secondary voltage is not listed. What I can tell you is the voltage on my amp right after the 5Y3 is 326 VDC if that helps any. You can buy the Heyboer transformers by themselves if you are interested. The kit I bought was much better than a Weber kit as far as appearance, fit & finish. A third party made the cabinet (Reasons Amplification) which is the best quality I've ever seen. Very nice. I have the ElectroHarmonix 6973's in the amp. I keep looking on Ebay for NOS 6973's but they are very expensive. Seems these were once popular in jukeboxes and were supposed to be a smaller version of the 6V6. Some pix of the amp:
http://i660.photobucket.com/albums/uu33 ... ure001.jpg
http://i660.photobucket.com/albums/uu33 ... ure019.jpg
http://i660.photobucket.com/albums/uu33 ... ure021.jpg
http://i660.photobucket.com/albums/uu33 ... ontga3.jpg
I have Sozo's and Russian paper in oil signal caps in the amp. Sounds great.
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Re: Supro Clones

Postby moritz on Sat May 30, 2009 6:43 pm

No problem, and thanks! I was going to email turretboards about this as I need to get a bunch of boards and stuff from them anyway. I just figured I'd ask incase you knew off hand. That's a very nice looking build you've got there, congrats! I believe you about the quality of the kit. From all the pics I've seen of these builds, it certainly looks right up there. I really like the front panel work on these kits too... very smart! 8)
I have some odd value mustards (by that I mean non-Marshall values) that fit some of the values of this amp; I'll use those and Sozos for the rest. I notice on the Supro 24 kit, there are a bunch of ceramic caps in the tremolo part of the circuit whose value fall into a range that you could use mustard/Sozo/polyester film type caps for (.03, .02 and .01 uF). I'm guessing these were chosen because the orignal used ceramics in those positions, but I wonder what effect, if any, mustard-type caps would have there... might have to do some experimentation when I get this build sorted. In fact, looking at the gut shots of the original Supro it appears that every cap in there, bar the electrolytics, was ceramic. :shock:
Yeah, the 6973s seem pricey and kinda hard to come by. At first, when I chose to embark upon this project, that was something that put me off this particular amp just a little when compared to the models with more "common" power tubes. However, after listening to a few clips I was sold. It seems the 6973s really are a pretty big factor in getting the particular sound and character of this amp which I love so much.
Also, there's a another schematic at Schematic Heaven in the bargain bin amps section: http://www.schematicheaven.com/bargainbin.htm (it's called "S6424", under Supro)
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Re: Supro Clones

Postby piperbob on Sat May 30, 2009 7:46 pm

I don't think the caps for the tremelo circuit make a difference weather they are ceramic, film and foil or whatever as they are not part of the sound signal. The ceramic caps are a lot easier to fit on the board tho. I have a number of circuit boards form turretboards too. They are all good quality. I like the turret type better than the eyelet myself. Recently I got a hair up my butt to get rid of the white noise on my Weber Super Reverb clone. I thought I'd redo the circuit board with a Hoffman board. I just found on my doorstep today an unloaded AB763 Hoffman style board from "The Airtight Garage". Good quality and the price was great compared to other makers of the boards ($50 shipped to my address). Have fun with your build.
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Re: Supro Clones

Postby F#m7 on Sat Mar 20, 2010 7:39 pm

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Re: Supro Clones

Postby 74 Strat on Sat May 15, 2010 8:12 pm

I built a 1624 clone and love it. I dropped a Tone Tubby in it. Here are a few photos...Dean



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Re: Supro Clones

Postby Baron Von Machinenmann on Sun May 16, 2010 10:40 pm

Sweet build!! Gut shots? :cheers:
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Re: Supro Clones

Postby RossNRoll on Sat Sep 11, 2010 4:53 pm

Demo wrote:As a fan, I'm just curious as to why nobody picked up on any of the variants of the Supro/National/Gretsch/etc designs and cloned them? I guess, in a way, Mark Baier (Victoria Amps) is with his clones a couple of Gretsch Amps. But the one I'm thinking of uses EL84's (Baier's version) in stead of the 6973's that I think were in the originals.

Notwithstanding the Zep hype, those were some very cool sounding amps. I especially like some of the many 1624 (Model 24) variants (probably not what Page used). Still THE only amp I have ever owned that I liked equally with HB's and SC's.

This is weird starting a thread on a new website where there are practically no others to get lost among? It's almost compelling to write something inspiring or controversial. I got nothing.


I realize this is an old thread but just wondering if anyone has the Victoria Regal II 1x15 amp and if so, how do you like it?
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