50 Watt Plexi with GZ34

maxwedge572 · Post by **maxwedge572** » Sat Mar 15, 2014 1:01 pm

I'm thinking about doing my next build like this, 50 watt Plexi split cathode but with a GZ34 rectifier. What do you think?

I have the JTM45 I built and my repaired 74 JMP50 (68 spec) and I was going to do a Black Flag but I think that this sounds like a better idea for summer fun!

OnTheFritz · Post by **OnTheFritz** » Sat Mar 15, 2014 2:19 pm

I've built just that, lead spec and totally smokes! Sold it on Ebay for a song, no reserve.

Sniped by the brother of a lead guitarist for a band from Michigan that opened for the NFL a few years ago. Sounded great live. Nuff said about that, argh.
Great sounding version of the '68 spec.

maxwedge572 · Post by **maxwedge572** » Sat Mar 15, 2014 2:52 pm

That sucks about losing $ on that, bummer! That's one reason I hate to sell things but.... this one is for me and will be mostly all NOS inside plus I have a set of Marstran transformers for it. I've also been thinking about tremolo but a 50 watt chassis for that would be harder to source outside of having one made my self.
Thanks for the feedback, Fritz

OnTheFritz · Post by **OnTheFritz** » Sat Mar 15, 2014 3:28 pm

You're very welcome for the feedback. Much pun intended literally!
I want to build another as I have a Drake 139 tranny on hand. Plan on trying the new gen Sozos.
I documented the build I mentioned, and have gut shots for personal reference. I did use .10 output coupling caps, like the thicker, fatter tone personally. But we build em' we can tweak em' to taste!

rgorke · Post by **rgorke** » Tue Mar 18, 2014 5:24 am

This is what my next build will probably end up being. I am aiming at a JTM50 with a GZ34 but have in my mind possibly (probably) a split cathode lead spec.

neikeel · Post by **neikeel** » Tue Mar 18, 2014 6:17 am

rgorke wrote:This is what my next build will probably end up being. I am aiming at a JTM50 with a GZ34 but have in my mind possibly (probably) a split cathode lead spec.

Built it correctly as stock and you might be surprised (just lower value of first cathode cap and use a small bright cap.

maxwedge572 · Post by **maxwedge572** » Tue Mar 18, 2014 1:03 pm

OnTheFritz wrote:You're very welcome for the feedback. Much pun intended literally!
I want to build another as I have a Drake 139 tranny on hand. Plan on trying the new gen Sozos.
I documented the build I mentioned, and have gut shots for personal reference. I did use .10 output coupling caps, like the thicker, fatter tone personally. But we build em' we can tweak em' to taste!

I think I'll stick with the .1 output caps and the 270pf/56k tone stack too but I'm going to use the .68uf bypass cap on v2a.

I'm planing on a longer 29 turret board to accommodate the on board 32/32 like a few of the vintage amps I've looked at but I'm having problems sourcing brown board material. Real pain looking for that stuff but I do have some G10/FR4 glass epoxy board in natural coming. It's kind of a yellow/green color and may look alright but I'm not sure I want to use it for this build.
Got it here and had them cut it to my spec and I'll end up with 6 undrilled boards.

http://www.eplastics.com/Plastic/G10_FR ... t/NAME_101

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50 Watt Plexi with GZ34

50 Watt Plexi with GZ34

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