First thing I would suspect is a leaky electrolytic or a tant that is shorted. I am leaning more to the electrolytic though. Seems like a "warm up" with a cap charging in time. Sounds like one of the

Hi all I am embarking on the likely arduous journey to resurrect my 7704A from tick mode. It was actually in tick mode when I bought it so I got a good deal (I hope!). I got it home and pulled some

I have two crts that I would like the data on and schematic of unit(s) they were in. The numbers are Dumont/Fairchild F7770-0P31 and ETC (Electron Tube Corp.) 54DGP11. Thanks. Mark

The listing already allows international shipping. -- Bob Haas

Sorry. I will update the listing to allow international shipping. -- Bob Haas

If you have a vise you could bend one from 3/16 piano wire, available at hobby shops.

Bit of a setback that they don't ship to the UK. They will ship other things to the UK, so I wonder why not these? Colin.

The vintageTEK Museum now has replacement 468 EPROMs: https://www.ebay.com/itm/114450705368 -- Bob Haas

Hey Jon, That's pretty curious. Note that this decouples -5.2C, which is a somewhat isolated sub-supply drawn from the -5.2A. It looks like this supply is only used by U403/U404, which are the

Bit more progress today!. The replacement CPU arrived and has been installed. I am now getting all of the correct signals on the CPU board as per the service manual and comparable with Tony's "quick

THANK YOU! I have been searching for this SERVICE ROM for some time. Now I have to find the chips, figure out how to load this file and use them. I sincerely appreciate this! -- Michael

It appears that I am a nit. I means to type "it" and a gremlin made me add an "n" to the beginning. Sorry.

Would you believe that I have a 7CT1N curve-tracer, but of course nit operates in the 7623A mainframe, which isn't working? I don't have another 7000-series mainframe, sadly. Colin.

I have just checked all of my 2N3055 stash using a magnet and they all have steel casings. I am afraid my electronics knowledge is too limited for me to be able to knock-up any test-rigs to do

Hi all, Does anyone know why C437 fitted to the TAS465 A1 pcb is bi-polar ? It's the bulk cap for the -5.2VC supply . Other caps on this board are Nichicon VX and provide the bulk caps for the +8.6VA

Thank you for uploading this.

@ Dave(52 re 511A. Way back when, when I was a wee engineer, I bought a surplus 511AD from my EE department as surplus. It was a cool scope, but was way more seat of the pants waveform visualization

Is that a 3AG fuse? I think this is the Littelfuse cap you need: 03453LS1HX020 Mouser sells them new, for under $4 Somewhere, I have a bunch of new PCB mount fuseholders that take

+1 very good to deal with