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Here is what I did with bridge rectifier

the film caps Make a difference. They are there to deal with any inductance in the rail supply wires. The closer to the collector of the outputs the better they work. Spread evenly between the four outputs is best.

Yes in parallel and space them apart

[QUOT)E="Oldskoolfan, post: 345809, member: 4520"]What if all you had was a pl400 transformer. Could build a complete WOPL 400?[/QUO I have a transformer on the shelf and thought of how to is it. you can buy am 400 for 200-400 any day of the week so not very practical

Hello interesting layout. Your Mylar .33uf cap need to go from rail to ground . In the photos it appears to me they go from rail to output, but I may not see it correctly. Also you would be happy to add a 1.5uf metal film caps along wi these .33uf caps. I use 2 1.5 on each rail along with a .33...

Was my mind in in the game today Retested with a 8 ohm load Thought distortion was way to low floor noise improved withis load attached I had to use the top AP to generate balanced output , because it’s a balanced setup machine and read the amp out put on the bottom AP

So having been up to the lake house and repairing my boiler I set down to test this new amp well had some issues with putting a ground wire on the wrong pin on the balanced to unbalanced board but that is sorted first the soft start does what I wanted only 4-5 amps to start up Wish I could...

You should look up my thread on reworking the c-500 I did two with great success look for Carver C-500 upgrade to WOPL

When we went to India at a shopping area call Chandni Chowk I was having to avoid wires. As you see my height was considerably higher than the average. The camera shots are at eye height. My wife could always find me as I was 1-2 foot taller than the rest

The only other item on the board is two .33 Panasonic metal film caps on the 12 and 11 pin in for both channels.

Mark they are what came from Joe so not change on my side

Don there is a .1 uf cap right after the regulator along with a 220 uf audio grade electrolytic cap. There is no oscillations of any concern.

I think it has a hard life with Peter LOL

Keep looking maybe on the underside on the completed photos this unit has extra row of MjL21196/96 as first drivers to the now 8 outputs to each channel I will stat testing to at 4 ohms and below. Looking for stable 2 ohm capabilities , not that I need it but I am looking for a set of...

Thanks for the Question Mark Good eagle eye there, how many more tweaks can you find? so to the answer I put a 1n5366bg Zenor diode to act as a max voltage regulator ahead of the rest of the regulator section. It’s a safety valve if you like. This limits down stream voltage to 39 voltes in...

Oops one fly back diodes in backwards

This unit has run daily for two years so I built an other one. the project is unorthodox for sure but I have reasons for this next build.. it’s a balanced input amp with lots of little differences to conventional build. I finished it today with testing to come.

Lee I did not concider the internal changes with my suggestion that said the RTA 1200 may be just eye candy from now on as you can buy a whole DBX setup for around $300 and get full control from your phone , iPad or tablet with adjustment out the wazoo

any good condenser mic should work. DBX has a real good one that are cheap on eBay. It will be far superior to the original PL mic dbx A-256 RTA-M Electret Condenser Real Time Analyzer Microphone