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Got the gauge measured. The plate is slightly undersized, and the 38.1 mm long feeler gauges slightly oversized in thickness, perfect length. Stacked for use, they're approximately .001 mm oversized, if I use averaged plate thickness. But this will slightly vary across the plate. Looks like...

Finally got the last piece I've been hunting. She's a little rough, but that's OK, didn't give much for her. Not sure there's a complete set of boards in it, we'll see. Need to finish some outside pressure washing and other chores before seeing if it's complete and has ferrite or sendust heads...

A dual binding post just fits. Used a NOS Radio Shack that's been in the parts box for years. A Pomona binding post base is slightly smaller and would be a easier install.

I'm building another for the test unit, so I'd thought I'd start a "how to" thread for those interested. The left channel circuitry is closer to the front, so here I'm loading the left channels 50k resistors which provide 50k impedance and no signal attenuation. It gets a little confusing, but...

Old switches were getting funky. C1353AABR2602AW is a exact replacement (with lettering). They also come in green (for Sniff).

Couple weeks back, did some square wave testing on a PL2000S2 preamp spare unit. Found severe ringing at 10 kHz.

Picked up a analog DC Millivolt meter just like I used in shop class long ago. Can't remember what the red and green accessories are used for. Adapters for measuring home heater thermocouples? Can't find anything on the web or even a Google Lens search result that matches. It's a solid and...

Got the first of two Furman PS-8R Series II in and on the bench. While back Gene asked how I was going to switch the system on and off once it's set up with a four way active crossover. My solution is to run two of these power sequencers. Unit is clean and works. Going to recap them if I can...

I'm recently retired and downsizing. I've three old school rf linear amps for sale. Texas Star DX350....$150 Texas Star DX250....$125 Elkin 200.........….......$100 I'll pay shipping. All have been in long term storage, but worked before retiring the units two decades ago. Each has one or two...

Gene, here's the formula from Watts Law. P(w)=Vrms(v)squared/8(ohms). Watts equal RMS output at the speaker jacks squared, divided by 8. O.K., so how do we use this? We hook up a signal generator to the amps input using BNC to RCA cables, and a RMS AC voltmeter to the speaker jacks. We select a...

Starting on the amp rebuild. Factory defect? Joe has commented many times about the engineering of these amps and where they put the chassis screws. F**k!

The QA403's are back in stock as of this morning. Just ordered one. Was considering waiting on the QA404 that are projected to be available in June-July, but given the world situation and the incremental improvements of the QA404, decided it was best to pull the trigger for the QA403. Should...

First, I want to thank Mark L. for showing me this was possible. This unit is a 400 S2 that will be WOPLED and was dropped on the bottom left corner bending the chassis and face plate. The part# in the photo works well and accepts 14 AWG for robust primary AC runs. Make a template, pay attention...

If you want to replace your attenuators with LEDs, it's easy. I used Dialight P/N 609-1122-120F. This is a 6 VDC module, that fits the standard 3/8" hole. At first they seem slightly undersized for 3/8", but they include a O-ring that fills the gap. Perhaps this is to prevent dust intrusion...

http://radio.garden/visit/ponce/oE3rg_5r

Just purchased one of these. Offered $45 and offer was accepted. They've sold 11 and have 1 more to move. https://www.ebay.com/itm/255763580061?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=vP7IkWOgSUu&sssrc=2349624&ssuid=yNB_S8D7Qg2&var=&widget_ver=artemis&media=COPY

So I have a good digital scope. The thought of using it to measure DC Offset and Noise came to me yesterday. Measuring DC Offset seems straightforward using the DC settings and voltage measurement functions. I assume noise is AC on the output jacks? Is it permissible to use shorting plugs on the...

Used 1/2" long DCP standoffs with success on the 400 S1 upgrades. On the full WOPL 400 S2, the relay was at interference with the Cylon meter mode switch. So some modification was in order. Note I'm using the original chassis. The new WOAD chassis are said to be deeper and this shouldn't be a...

Today, if time permits, I'll be upgrading to a 700 style terminal strip, step washers on the transformer bolts, and upgrading the B+ and B- wiring from under the buss bar to across the storage caps. Note the Phoenix Contact Connectors on the backplanes and control board, a full complement. I've...

Check it out. Reasonable BIN price. Face is a little rough. I'd go for it but don't need another amp, and a 400 is plenty good for me. https://www.ebay.com/itm/325176470303?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=Lk1Qn1UiSda&sssrc=2349624&ssuid=yNB_S8D7Qg2&var=&widget_ver=artemis&media=COPY