L-C supply with the big cap and a 157G Hammond. Chassis is only 5 3/4 by 11. space is at a premium. I hope I can cram it all in.
regards,
Douglas

I have to get the R-set 1k trip pots. I hope R-S has them. I'm getting the little heatsinks from themtoo. 4-40 screws from Lowes to attach them to the TO-220 MOSFETS.

I loked at the box, there is no way I'm getting one of those 100-mike Pop-can sized caps under there. the sol'n is even cheaper. A trip to the photo shop for some disposable flash cameras. They have 100 uF/330 volt flash caps inside. a few hundred mikes of them ought to do the trick. I may put in a 6NO30 delay relay to turn on the 6CA4's heater...probably just put in a 40k bleeder resistor. Perhaps 33k as I have soem IRC GS3 3W metal film. The small resistro provides enough draw to pull the voltage significantly lower than root2* RMS.

I hope my camera works well enough with close ups.

This is what it looked like with two 5687 and ForePlay circuit.
regards,
Douglas

The parts compromises are Time expedients. I could make another plate, but that would take a bit ov time. Poke one more hole or start from scratch. The photo-flash are a second choice by a mile. They are easy to get and small enough. they're better than a lot of 'lytics. Just not all that compared to a good oiler.

I am putting in a Hammond 157G, the little one from the cheap build I think. I have a 193C and may try cramming it on top. Look at my new linestage, I'm not restricting myself. I also want it done in time for the Bottlehead meet in Maryland in March. Nice exposure with pix and everything.
regards,
Douglas

The circuit of those amps uses the tertiary widing in the OPTx for cathode feedback. Cascaded diff amps, a 6BL7 to a 7236 was the last combo I tried. It sounded great. The OPTx was definately the limiting factor. I am designing a replacement on a smaller core with a better interleaving schedule. I am aiming for the Quad II 9 3/8:1 ratio. It is taking a bit of iterating, that's for sure.

Remember, the flash caps are a budget and space expediency, I don't think they are designed for continious charge storage. They seem to survive it adequately( and I can put together a few hundred uF from a parallel connection ). If I didn't already have most of a chassis ready to go, I'd use the motor run caps I have in a box in a second.
regards,
Douglas

So I took out the A441( had been runnig it Quad II style with cathode NFB with its Tertiary winding ) and put in the A431( the Mk.III OPTx ). I needed the screen taps for the E-Linear connection for the front end. 12BY7A's with a shunt regulator for its screens. It Rocks. Almost 40 watts. It makes a lot of heat though.

The Dynaco OPTx is what is holding it back. I need better Iron. Not that it's bad, just the rest is that good.
regards,
Douglas