See http://w140.com/smb/DC508A_SM.pdf page 1-1.

( I sent this some time ago but I think I only sent it to myself, I'll try again) When I was servicing TV's (mid 60's!) we carried, in our tube caddy, tiny auto-transformers that would, for most BW tu

When I was servicing TV's (mid 60's!) we carried, in our tube caddy tiny auto-transformers that would, for most BW tubes plug inline with the socket and boost the heater voltage by a volt or so. For C

Just as an op-amp (with negative feedback) nulls the voltage between the inverting and non-inverting inputs here the nulling is done with wetware and the center zero meter.

I the corrosion/staining shown in the photos below a known problem? Can it be cleaned or has the finish been eaten? It is CL about an hour away and I'd like to know what to look for. thanks [cid:part1

Thanks to John, Bert Trevor Dennis, David, and John H for your informative and insightful comments on the 7613 and the 7603. I've got my fingers crossed for a ham-fest on the 19th. cheers

Hi Bert, After reading the comments about the 7613 I have to agree that the 7603 is a better deal. Good luck selling your 7623 cheers

use "dennis@..."

If low deflection (short sweep) was caused by a HV problem it would mean that the HV was too high, not too low. Could be a problem in the HV feedback loop but to get only a 1/2 scale trace you would n

Sounds like there could be a problem with the bandwidth limit switch or circuit.

https://www.ebay.com/itm/tektronix-7613-Oscilloscope/323970848553?hash=item4b6e2ad729:g:4O0AAOSwQj9dwdRD Looks like a good way to get a 7000 series scope so I can again use the amazing 7A22. I don't n

I wonder what an Uber to Columbus OhiO would cost.

[cid:part1.E4A154FB.31B925D5@...]

Chuck has it exactly right, in this day and age a 1 TB scanning project should not be beyond the reach of this group. Just as I support Wikipedia I'd be happy to chip in a Hamilton. I would add, howev

I just took apart the HV XFMR from my 561. The core is a ferrite or powdered iron E-E type. After removing the wrap around the core, the two E's separated easily at room temperature. Still hoping some

Does anyone have the winding data for the 561 HV transformer? The manual shows it to be Tektronix part 120-225. thanks