Hammond AO-43 Guitar Amp Build Options with Amp Layout

[Yamariv]

Darn, that's what I figured I'm looking for true to the original layouts, anyone know of another good source by chance?

[sluckey]

Darn, that's what I figured I'm looking for true to the original layouts, anyone know of another good source by chance?

That's odd. Never seen anyone that was converting an old Hammond amp that was also looking for an original layout. Good luck with that!

[Phil_S]

Oh, c'mon. Get over it. There is no original. You'll have some fun going into modestly shallow new depths.

[M Fowler]

True original layouts for what? I reread the above posts and can't figure out what your asking for!

[pompeiisneaks]

Does anyone have or know of any good wiring layouts to do a 6V6 Plexi? ...

This one...

[Phil_S]

https://mhuss.com/Plexi6V6/
https://robrobinette.com/How_the_Marsha ... _Works.htm

[M Fowler]

There all over the internet search and on this site as well as others.

Below is 3 for you to look over.

Mark

turret__plexi6v6_layout_148.pdf

18w-6v6_layout_204.jpg

jcm800 6v6.jpg

[Yamariv]

Not quite sure why a few of you felt that my polite thread deserved snarky replies like above. I hope this forum ins't like this normally.. What I was asking for is a true to the original JCM800 circuit layout with some 6V6 power tubes. I am not looking for an amp builders modified "take" on the JCM800. Don't think that's an odd question to ask at all really..

Thanks to the others for your help and posting some layouts, that's pretty much what I was looking for! Cheers

[dorrisant]

I have a board layout for a JCM800 that will fit in that chassis. Let me get back to my computer a little later and I'll post it.

[M Fowler]

Well there is the Mark Huss/Martin Manning 6v6 layout based of the Mark Huss 6v6 plexi schematic that would be true to the original.

Mark

[Yamariv]

So I think I've decided on a 6V6 Plexi clone to build with this AO-43 chassis. I've found several versions thanks to all your suggestions and others online but am wondering what type of setup for Cap Cans to go with.. every layout I've found has vastly different Filter cap specs..how do I decide what would be best with a 6V6 power tube?.. Does it really change anything if I'm going with 50uf caps vs 32uf caps and so on? Also, any recommendation on the best grid resistors and any other resistors I should change for this 6V6 substitution? Thanks guys!

[Colossal]

So I think I've decided on a 6V6 Plexi clone to build with this AO-43 chassis. I've found several versions thanks to all your suggestions and others online but am wondering what type of setup for Cap Cans to go with.. every layout I've found has vastly different Filter cap specs..how do I decide what would be best with a 6V6 power tube?.. Does it really change anything if I'm going with 50uf caps vs 32uf caps and so on? Also, any recommendation on the best grid resistors and any other resistors I should change for this 6V6 substitution? Thanks guys!

FWIW, I built one of these some ten years ago. A fun amp and loud. I settled on 47uF - (5k 5W - Choke) - 47uF for the power supply. An experiment doubling B+1 to 96uF made the amp way too stiff and fast and buzzy. Mine was running stupid high plate voltages with series resistance with the choke to bring the screen voltage down. I used a 20W 2061 output transformer at 7k6 primary. The amp had a chewy sound with a spongey feel and I preferred the sound and feel of SS rectification vs. a 5U4. The 5U4 loosened it up a bit much. Quite compressed sounding with a bit of a pronounced bark (high voltages). JJ 6V6Ss tolerated the abuse.

[thetragichero]

most folks try to stay below the 40uf listed on the 5u4 data sheet for the first filter capacitor
i used 50/50 multisection caps in my ao-43 conversion because i had em on hand. I'll order 32/32s for the next one

[Yamariv]

Very interesting, so the filter caps and their capacitance values actually do affect the sound! Learning every day, thanks guys! So should I just stick with 32uf across the board then? Cheers

[thetragichero]

are you using a power supply choke after the first filter cap? it's a little higher inductance than what one would normally use, but the choke that's on the reverb out on the two ao-43 chassis I've come across is the right price (free/included) and worked for me. after that i don't think it matters much
i would suggest downloading Duncan amps power supply designer as you can plug all your info in and it'll tell you if it's gonna blow up
the tone stack calculator from the same site comes in mighty handy too