Hi Torch , I think I have found a solution -- an Ebay seller had a Stancor transformer 6.3v @ 1.2A rated for 5kV at a reasonable price , so I am now just waiting for the post . Brian (UK)

Hi agree , he should be here Brian (UK)

Hi everyone , I need help . My 661 has HV insulation breakdown in the power transformer and I need a suitable 6v transformer that can stand working at 3KV for the CRT heater . Here in the UK most sour

Hi , I am wanting to find a couple of old Tektronix plug-ins . They are from the rather old 661 sampling oscilloscope . I need a 4S2A and also a 4S3 plugin to complete my system :- please note that I

Hi again , thanks for the info . Brian (UK)

Hi,you might get more interest if some of us knew where you were , I am interested in a 7603 but as with everything these days shipping cost is a nightmare and a determining factor in any purchase . B

Hi,I was concerned about the bridge rectifier temperature when I first got mine, I have since taken it off the pcb as was beginning to discolour with the heat and I have placed it on the metal chassis

Hi Hakan , thank you for that info , I'll have to keep looking or try harder to fix the supply in my 7834 which just sits there and ticks . Brian

I am in need of a new or working power supply for my ailing 7834 and I have access to this one 620-0276-00 which looks the same but with a different part number ? so I am wondering what scope it has c

I am tempted but I fear the shipping will be a real killer .I have a non-working 3T77A that is complete and would want to try and one good one from the two I also have a 3T4 in a similar state regards

Hi Walter , I wouldnt wish that on anyone . I wish you good luck Brian

I agree with that , the line filter in my 7104 went . Fortunately the earth leakage breaker went before any explosion in that instance but other instruments using that same age and brand of line filte

Hi Raymond Would I be anywhere near right if I suggested the P6230 -- is that the one providing DC offset . If I am wrong then I would gp for the P6056/6057 Brian

I like the P6201 also , I'm lucky enough to have 4 complete sets . I have not used them with a 7S14 though only the resistive probes . I have a 7S14 acquired long before the P6201's but the sampler ha

Hi Raymond I cant afford better than the P6201 and a home made 1101 substitute , if I need better I have a P6056 and P6057 resistive probes but of course no Hi-Z input Brian

Hi , if my memory serves me correctly the P6202 FET probe is only 500MHz so you will likely need a P6201 and an 1101 psu for maximum B/W Brian

I was made curious by this thread but I've not seen all posts . Has anyone considered the 661 sampling scope and its plug-ins as candidate for the earliest . regards Brian

Hi Kaveh I have a 7904 manual for the serial number ranges B010100 - B079999 and also B080000 - B209999looking at the parts list there are a few 151-0220-00 but nothing with the last digits being 414

Hi Tom sorry about that I must be remembering one of the other devices from that series . I have not had any fail on me yet and it was several years ago that I made both of those repairs , naturally I

Hi DaveI have also used HSMS8202 to repair S3A probes and have even made a replacement sampling sampling gate for an S6 sampling head . I can recommend them for the purpose , they have a higher revers