Supro build and cermaic caps or?

[max_lwedge]

I am building a Supro inspired amp. I have an original 1600 Supreme, a rats nest chock full of ceramic disks. I have never used ceramics in a build other than small ones in tone stacks, bright caps and so on. I remember seeing a scope trace showing quite a bit of hysteresis with ceramics. Any recomendations on these, pro or con? Brand, types? What's been the experince with Supro type circuits with different cap types?

I also notice almost all Supros have 10uf on the screen part of the power supply, some with a 1K feeding it, occasionally a 2K. I read the lowish cap value was to protect the screens of the 6973, but I suspect it is more about screen compression. Thoughts?

[pompeiisneaks]

Sluckey seems to be the supro expert, maybe he'll have some input, but basically the ceramics were something I was scared off of somewhere for naught. Yes crappy ceramics can sound crappy, but so long as you get X5F ceramics they're perfectly fine for audio path work. I bought some Vishay ones off of mouser that were the ducks guts.

Something kinda like this:

https://www.mouser.com/ProductDetail/Vi ... LIln8Ys%3d

that's just a random 330pF one I found in searching, but that's the series etc.

~Phil

[sluckey]

I'm not a Supro expert. I built a Supro S-6424 but did not use any ceramic. I used Xicon chicklets and M-150s because I had them. It works fine. I suspect ceramic caps had more to do with price point rather than some secret mojo. I don't have anything against ceramics. Tons were used in the '60s.

Here's mine... http://sluckeyamps.com/supro/supro.htm

Xtian also built this amp so he's an expert too!

[xtian]

Xtian also built this amp so he's an expert too!

Yeah, only built one so far, so, expert now.

You can check my component choices in my build thread: https://ampgarage.com/forum/viewtopic.php?f=6&t=31639

but I mostly used what I had on hand already.

Still really pleased with this amp!

[pompeiisneaks]

I just like calling you an expert okay

~Phil

[chief mushroom cloud]

I built a few Supro Thunderbolt clones (using original Valco 5k OTs from Wards Airline carcass's) and used Vishay/Cera-mite 564R ceramics throughout...stuck w/ original filtering scheme. We called them Thunderchickens. A friend of mine has them as says 'they are best sounding JTM45s he ever heard'