Drake AC4R Replacement PSB

That old Drake AC4 getting a little rough around the edges? Can’t locate those high voltage capacitors without taking out a bank loan? Well then perhaps the solution is to install the new AC4R upgrade pc board. No, it’s not from Drake, and no Drake did not use a pc board in their original AC4 design.

Here’s what we’ve done for the AC4R upgrade:

Increase all the silicon diode ratings to 1.5 amp @ 1000 volts

Increase high voltage rating of the electrolytic capacitors

Increase wattage of the bleeder resistors

Mounted the bleeder resistors, bias resistors and R3 on to the pc board (original bias pot still used)

All resistors are flameproof 1 watt, 3 watt and 5 watt

Resistor R3 is now rated at 10 watts instead of the original 5 watts

With the exception of the bias set trimmer, all parts mount on a single PC board

No holes to drill.

Easy to assemble with complete assembly instructions

PC board is double sided with plated through holes. Solder mask on both sides and component AND solder side silk screen.

While the AC4R is an easy to build project, there are a lot of wires that must be cut, moved and reconnected to the new pc board. The project is not for the faint of heart. So I will be offering these two options.

Options:

1. For those that don’t have the time, or simply can’t see anymore to assemble the pc board, we will stuff the board for an additional $10.

2. And for those that do not like messing with high voltage or hot soldering irons, we will assemble, install and test your AC4 for an additional $45 above the kit price. Customer to pay for shipping both ways for the AC4 supply.