PI supply cap

[dude]

I'm drawing up a layout, the PI plates HV supply capacitor, would that caps ground be best at the Star Ground near the PT with the the other HV grounds or down by the input jack and the pre-amp capacitor ground?

[sluckey]

I've grounded it in both places depending on the particular schematic and also if I'm using multi-cap cans or individual caps.

Using individual caps in a circuit that has a NFB loop from the OT, I will ground the cap with all the power amp caps.

[dude]

No NFB, no tremolo, single channel with reverb only, l'll run the PI cap ground to power side, what about the reverb tube plates, run their cap ground to pre-amp side along with cap ground from input tube plates? Thanks

[shooter]

I looked at a re-issue PR verb;
the drive tube is grounded at main power, the recovery tube is grounded at the preamp

[dude]

I looked at a re-issue PR verb;
the drive tube is grounded at main power, the recovery tube is grounded at the preamp

Thanks, that helps. Don't want surprise hums

[dude]

Most BF layouts don't show the caps grounding scheme, they have dog houses. One layout l'm following for advice has two filters, one before SB switch and one at the screens both grounded on power side, of the other "two" go to PI, reverb and pre-amp plates. I want to use a fifth filter and not share the PI with the Verb. I know a schematic help with advice but don't have the ok to post it. Does the above with the fifth cap seem a go, basically like the 6v6 plexi, with 5ar4

[sluckey]

I know a schematic help with advice but don't have the ok to post it.

You working on some super secret project? Best keep it out of public forums. Everybody will be stealing your thunder. 

[dude]

Yeah, in  my dreams... , l have to do something besides 6V6 Plexi's with all those AO-43 chassis l have. Only problem is those chassis are a tough cookie to jam a circuit into, too narrow. I have six out in the shop, need ideas want to do something different. Ton of work unless you want EL84s, done that, l like an eight pin socket. Nothing fits. So thought about a Super Reverb or Vibrolux, without trem, single channel, PPIMV, full tone stack and reverb. A lot to jam into that chassis. Biggest issue is drilling the sockets out, too close together to enlarge, have to cut the  chassis, add metal, then a board doesn't fit. Besides a November or 18 watt style what....? Any ideas.

[sluckey]

Hey, you know what I did with my chassis. 

Once you abandon that chassis and just salvage the iron, a whole world of ideas will open up. But, if you really are attached to the chassis there is a forum member that has put a lot of AB763 circuits in that chassis, including reverb and tremolo. I think he even did a stereo rig. You'll have to search the forum for him since I don't have the ok to post his name.   

[dude]

How about this idea for an AO-43. EL84's have their limits, 6V6's are great tubes but the socket holes in that Hammond chassis are an issue. What if, just cut out a rectangle where the EL84 holes where. attach a plate, drill octal sockets, that's it. As far as the narrow width, do what Hammond did, mount the board vertical, toss the cone bd. As far as filters, use the already cut hole on the preamp side, use a 40,20,20,20 can there. Take the PT, same location just use 1" standoffs and raise it, done. Much more room to space those 6V6s, three preamp holes and a rectifier or SS. Cut a board as long as fits, probably get close to 14" of a narrow but longer bd. So, might be a challenge to design a layout with a very narrow bd. but be creative. I bet l could get a Deluxe Reverb circuit this way, there would be room for standoffs bars, for bias supply, and other stuff. So, before I take the trip, since your opinions are valued here, what's your take  or am l dancing in the moonlight...?

[sluckey]

Now you're cookin'! Those are all some good ideas. I ain't loving the vertical board though. I've worked on a lot of those before. Changing parts can be a bitch!

I've got a couple ideas to throw in the mix... Use 6973 tubes (like in my Supro). Sounds like a 6V6 and has the same power. Nine pin noval sockets will fit with no chassis modifications.

One more... Look at my TDR, a single channel AB763 with reverb, no trem. And the board is only 2.2" x 10.8". Probably easily fit your narrow chassis. Mine is in a 3x4x17 chassis.

I finally remembered the member's name that built a lot of AB763s in those AO-43 chassis. It's Toxophilite (I didn't need permission. I just couldn't recall his name yesterday.)   

[dude]

Food for thought

Thanks

[shooter]

not sure where home is, out here a 12 pack n a twisted gets a nice piece of aluminum bent any way you want