New to me paraglow monoblocks

[Paul Joppa]

Notes interspersed

I. Component Value Changes
Driver Cathode: Changed from 274 ohm to 180 ohm (Increases 5965 current to ~10mA).

That's for 150v at the 5965 plate, a compromise when direct-coupled. To use the Stereomour upgrade kit, you'll want more like ~200v, which alters the resistors.

C4S Board R1: Changed from 237 ohm to 150 ohm (Sets C4S current to match 10mA target
2A3 Cathode: Fixed at 3k ohm (Two 1.5k ohm Mills MRA-12 in series).

Depends on which circuit you choose - that's not clear yet.

Main Dropper Resistor: Changed from 1k ohm to 2.2k ohm Mills MRA-12.

Why?

C4S Protection (New): Added 15k ohm 12W Mills resistor between supply rail and C4S input to pre-drop voltage.

Depends.

Grid Stopper: Changed from 1k ohm to 681 ohm.

OK

II. Topological & Wiring Changes
Driver Power Feed: Driver stage is fed directly from the power supply rail (after 2.2k dropper) rather than being tapped from the 2A3 cathode.

For SRC4S?

Standby Implementation: SPST toggle switch breaking the High-Voltage Center Tap to Ground. A 100k ohm 2W resistor is wired across the switch lugs.

Power Supply Filter: CLC configuration using DC Link Capacitors. Each cap is bypassed with a 0.1uF high-quality film capacitor.

AC Input Snubber: 1 ohm 10W Mills MRA-12 + 0.1uF X2-rated Safety Capacitor at the IEC inlet.

Rectification: Solid-state Schottky diode bridge

A full bridge would double the voltage, to 900vDC - you don't want that. Just use two diodes.

-PJ

 

[superchunk]

OK, here's your reminder :^)

I'll post again shortly with notes on the changes.

Yes, thank you. I'll never scan it but a few pics of schematic and whatnot is good enough, msg me your address and I'll get it out next week.

 

[Paul Joppa]

ok so, I ordered 4 x 100uf wima dc link caps, and am ordering some new resistors to increase the voltage to the 2a3 and drivers a bit.

Just want to run it by the experts before buying. I will then rewire everything, new caps etc...

New resistors:
- cathode resistor to 900ohm - 10w ww - use 4x 910 10w I. series/parallel to get 910 40w

- drop resistor b - 1.2k 10w ww

The proper cathode resistor is 750 ohms and the B+ supply is 300v, at least if you do not keep it direct-coupled. You might get that if you use a choke-input power supply topology.

 

[superchunk]

Notes interspersed

I. Component Value Changes
Driver Cathode: Changed from 274 ohm to 180 ohm (Increases 5965 current to ~10mA).

That's for 150v at the 5965 plate, a compromise when direct-coupled. To use the Stereomour upgrade kit, you'll want more like ~200v, which alters the resistors.

C4S Board R1: Changed from 237 ohm to 150 ohm (Sets C4S current to match 10mA target
2A3 Cathode: Fixed at 3k ohm (Two 1.5k ohm Mills MRA-12 in series).

Depends on which circuit you choose - that's not clear yet.

Main Dropper Resistor: Changed from 1k ohm to 2.2k ohm Mills MRA-12.

Why?

C4S Protection (New): Added 15k ohm 12W Mills resistor between supply rail and C4S input to pre-drop voltage.

Depends.

Grid Stopper: Changed from 1k ohm to 681 ohm.

OK

II. Topological & Wiring Changes
Driver Power Feed: Driver stage is fed directly from the power supply rail (after 2.2k dropper) rather than being tapped from the 2A3 cathode.

For SRC4S?

Standby Implementation: SPST toggle switch breaking the High-Voltage Center Tap to Ground. A 100k ohm 2W resistor is wired across the switch lugs.

Power Supply Filter: CLC configuration using DC Link Capacitors. Each cap is bypassed with a 0.1uF high-quality film capacitor.

AC Input Snubber: 1 ohm 10W Mills MRA-12 + 0.1uF X2-rated Safety Capacitor at the IEC inlet.

Rectification: Solid-state Schottky diode bridge

A full bridge would double the voltage, to 900vDC - you don't want that. Just use two diodes.

-PJ

Yeah so, I see where the mistakes are, I let the llm convince me of some things based on the rectifier which I know isn't a full wave bridge.

Either way, it looks like I should reevaluate based on the shunt regulator kit - that will work for me, yes?

Once I fully understand how that fits in I will go over everything again. I understand it, then I get jumbled then I understand again....