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After Keith's report that he had already exchanged Q1418, I had a look into a 465 in my possession. As it turns out, possibly Q1418 can be removed without removing the vertical board, maybe sideways

I'm so glad to hear about your rescue, William! I also obtained a 453 rescued from a potentially terrible fate. Phil's 453 manual has been digitised here:

Thanks Phil! At least I found how I blew F1419... when I remounted Q1418 its collecter screw lug was bent at an angle such that it contacted the case...

Questionable how much value there really is in those chips.? I have a similar-ish collection.? But I get paid by the hour at work, so I have to subtract the time it would take me to sort them,

I have a late serial number 453, that seems to have a combination of boards, seemingly like yours. To your advantage, I submitted my manual for scanning, so you might want to get ahold of Toby, a

Hi Keith, I’ve chased my tail like this so many times, my back as permanently twisted. I have to sleep on my side, now! Next week will bring some clarity, and perspective, I’m sure... see you

Are you sure this is not the typical leaky HV transformer winding problem that seems to affect practically all the 453 series scopes and other similar models simply due to the transformer HV winding

Well... you know how sometimes you feel like you just maybe shouldn't have gotten up this morning? I'm having one of those days... I evidently wired the substitute 2N3055 wrong and blew my the line

Ok, more info. I have no repair history, I got it for scrap price from an e-waste guy who used to sell at a,small flea market. It had a nice manual with it, but for a very different scope. I have

I have a PDF of the 8212 recorder manual. I can send it to anyone who needs it; just send an email. to dgminala at mediacombb dot net. It took an exchange of emails with one of the older Spectracom

Hmmm... Isn't Q1418 connected to P1400? If so, it's easy to replace _physically_... photo: /g/TekScopes/photo/49286/10?p=Name,,,20,1,0,0 As stated previously, I have a 464 that also

============================================================= Hfe - Beta. Rolynn Tek Bvtn and Sunset 1966-1971

I've had to remove that on a 475; I expect the 465 is similar. The four 1/4 inch nuts that secure it to the front panel are a pig: there’s no way a spanner can reach them. Fortunately extension

AFAIR, at least the vertical board must be disconnected (several peltola connectors and the like) and removed. In order to do that, the front BNC's for CH1 and CH2 have to be removed as well as

Hmmm less than I expected, but difficult to say if this could be the problem. I once more checked an original 151-0140-00 and an "arbitrary" 2N3055 (date 1973). Low currents DC gain was 100 for the

Bill 1) (C) dates have no real bearing on date of manufacture they can be years apart or even decades apart. 2) Unless you know or have access to the repair history for your unit, anything is possible

Disagree ?

Perhaps more than you might think - and they don't even have to be unused. Look at the fleabay prices for "mustard capacitors" and "germanium transistor"

I believe microwave oven HV diodes will be too slow to use for the HV diodes in a scope. The scope HV inverter runs at 20 kHz or more. The oven diodes are used at 60 Hz and their reverse recovery time

I decided to dig into an early 453. Interestingly it does not match the schematics for the 453 or the 453A - some boards seem closer to the A, some to the earlier one - for example the Z axis board is