The small ICs all over the 7A26 board are socketed. I would be inclined to suspect gain set components rather than the ICs themselves. David

Most of the fancy IC's in the 7000 series are socketed, using the little insert style of socket pins. Look for a bit of white rubber stuff around each pin on the component side for

I have purchased a number of the ICs - #155-0078-10 in order to do some swapping. I am still wondering if theses ICs are soldered in or not. Does anyone have experience of them? TIA, Colin.

Hi to All, Still looking for the 92HS8(E) Mainframe Interface Boards. Their PN's are: 670-9767-XX (Master Interface Board) and 670-9768-XX (Standard Interface Board). In addition also looking for

I guess it took a while for my post to be approved. Enjoy!

OK, I don't have one, but there's a certain way most of them are designed.  Firstly, go look at the block diagram of the vertical section. Working from the plates backward, you have the output

The schematics finally turned up. See here: https://www.eevblog.com/forum/testgear/tektronix-ps2520g-ps2521g-and-gw-instek-ppt-pps-schematics-and-cal/.

I too would be interested in some. Please let us know what's available at what price, and the parts/repairable status.

Wow...you really seem to know your 465B's Horizontal Circuit! Some of what you Suggest I Understand... some of it I Do Not. LoL I can tell you that the Left Deflection Plate Voltage is +47.9V

Then I guess we need to do it the hard way. Looking at the horizontal plates, short them together temporarily.  Whatever you get ought to be centered horizontally (more or less) and vertical we

Ok....just checked my Unit again and it shows a bit of the odd behaviour when adjusting the variable capacitor...applied low viscosity (yellow) deoxit this time to both of the capacitor's brass shaft

Hi Walter... I mentioned a similar experience a couple months back after tolerating it for a while. The solution I found was related to the variable capacitor shaft contact and the range selector

Hi Walter, I would be interested by some modules. Do you have a full list? Also, the PS501-1 should be simple to fix. Thank you. Best regards, wrote: -- /* Lin Ke-Fong * anotherlin@... *

The scope has the lithium (keeper 2) battery. I checked it's voltage and it's 3.52 V, so I guess it's still fine. I was planning a recap of the PSU, as soon as I get some vishay replacement I'll do

Yes

It is possible, I see many scopes with bad PSU, that will appear to work, sort of. I am quite sure that yours needs caps. The PSU may have been repaired in the past, many were. Likely poorly, with

Strange, U4269 is an unusual case; two numbers used, depends on s/n. 156-0197-00 (NSC LM3146N) only used on s/n B010100 through B039319 and 156-0048-03 (MOT SC77161P) used on B039320 and up. I have

The scope was never touched internally (the nvram battery is still the original one and no recap was made). I guess I found a "solution" to the problem: if I let the scope warm up for like 10-15

I have been fixing TM500 stuff for the last week, and slowly accumulating a pile of bad plug ins that I don't want to fix. all look good cosmetically, complete with covers, but are triplicates or

You're right, that 5-transistor array *is* an IC. Raymond