Search results

I finally got my watch in one piece and I have to give Jim a BIG SHOUT OUT for getting it presentable. I hade somebody polish it local and it's probably Over-Polished but it had some pretty big scratches in it from 1967 to present. I think it turned out killer. I put a new aftermarket band...

No sweat Joe, I found a Power Supply board for B+ (250VDC) and the 6.3VDC heater voltage and they are green. I'll be building the boards soon. The power supply is adjustable and should work for the 2 voltages I need for the preamp for left AND right. The big old toroid I have is overkill but...

Naw, it's just a project, maybe a garage system. I have a 700 II waiting in the wings and who wouldn"t want a blaster in the garage?? That way when I'm on the riding mower, I can still head-bang..... :) I won't get rid of my Acurus RL-11 preamp. so the tube pre is for fun (free fun).

I saw a couple that are regulated and adjustable and can be upgraded with NON-CINA caps and I can fit 2 in the chassis for L & R. The toroid I have fit in the PS Chassis with an 1/8th to spare.

Has anybody ever used one of the tube preamp power supplies they sell on the net? I saw a couple and they put out the voltage I need. One of them is adjustable from 100VDC to 350VDC with appropriate AC in and it also has a 6-12vdc output for the filament. I don't want to spend BIG bucks on a...

Glad I didn't spend much time making my own schematic.... I tested the left toroid........ it was dead, and the primary was drawing a shitload of current with no output to the secondaries. Then I tested the right toroid, it was also dead. I pulled them both and the underside of both was...

That's why I couldnt chuck it.

I'm going through 800 pages of Motorola diodes It says: SZP 401 82 8240 It appears to be a zener but I aint finding shit

I just about finished with the reverse eng of the board.

They are coated and wrapped, painted with something.

Yup, my BIG 1 piece board is to charred to see through.

Thanks Joe, nice to get fresh eyes on it.

Yeah, there are 4 of them.

Yep, that will work. I'll use my little 12VDC Power Supply on it. If I need more power, I'll crack out the big guy. I want to try making 2 separate boards.

I can do that.

I wouldn't doubt that. Any way to ID them if I have the one side of the PS up and running or by seeing how they had it in the circuit with the resistor?

Not custom made, maybe custom marked??? I found zero info on a part number like that and this is from the 90's so it aint that old.

I guess I should just pull the PS board and make my own skizmo..... I have a couple (2 on each side) unmarked Zener Diodes that I'll have to figure out what the hell they are. They are in the regulator circuit and marked Motorola SZP 401 82 8240 which MAY be a part Melos had custom marked...

Now if I can figure out the voltages which are fed to the pre-amp box. Plus not knowing the output of the transformers makes it difficult. I suppose I could hook the transformer(s) up to 120vac and see what the pairs of windings are putting out. Without a load on the system it may not give me...

Anybody ever built one of these power supply boards for a tube pre??? I guess I'd need a bare board (or 2) with adjustable V-out. Damn Cina boards!