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Test Equipment Anonymous (TEA) group therapy thread

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iainwhite:

--- Quote from: mnementh on May 19, 2018, 01:48:25 pm ---Just out of curiosity... what breed of feathered friend is it? Garden variety robin or something else?

--- End quote ---
Looks like a European robin to me.

bd139:

--- Quote from: tautech on May 19, 2018, 08:18:33 pm ---
--- Quote from: bd139 on May 19, 2018, 06:14:22 pm ---I have a car full of D83s at the moment - woot :)

--- End quote ---
:-+
And just what is this calibration fixture you speak of ?  :-//

The multiplier is no big deal as there's a good thread here I'll dig out for you if you want to roll your own.
IIRC it was for a 465 which might only be 4 stages but another can be stitched on easily for a D83.
Is the 2nd unit is otherwise complete ?

--- End quote ---

Well got everything home. The main D83 seems to work although the HT starts whining after a couple of minutes and the filter caps are running stupid hot. Also some issues with channel 1 attenuator.  Second one I haven’t even cracked open yet. Lots of fixing fun to do.

Calibration fixture is a “raw” input plugin for the horizontal amp. Basically it just has a BNC and buffer that allows you to deliver a signal to the X amp directly.

Second unit is in bits. Seems complete however. Someone has attempted to repair the Y amp with wire wound ballast resistors  :palm: but otherwise looks good. The multiplier is shot on it.

I’ve seen the 465 multiplier rebuild. Might have a bash at that. Will get some microwave oven diodes off aliexpress :D

Hours of fun ahead. Will post some photos later if I get a few minutes.

Honestly I’m going to have to rebuild one of these from scratch by the looks and QA each board properly. Might take a while. It’s the learning that’s interesting though :)

bd139:
Quick picture. Note the replaced labels (the other plugin fascia is better so I will swap it) and the replacement timebase knob someone made (I have someone who will send me a real one).

Original capacitors. Nice sharp trace.

tautech:

--- Quote from: bd139 on May 19, 2018, 08:43:51 pm ---
--- Quote from: tautech on May 19, 2018, 08:18:33 pm ---
--- Quote from: bd139 on May 19, 2018, 06:14:22 pm ---I have a car full of D83s at the moment - woot :)

--- End quote ---
:-+
And just what is this calibration fixture you speak of ?  :-//

The multiplier is no big deal as there's a good thread here I'll dig out for you if you want to roll your own.
IIRC it was for a 465 which might only be 4 stages but another can be stitched on easily for a D83.
Is the 2nd unit is otherwise complete ?

--- End quote ---

Well got everything home. The main D83 seems to work although the HT starts whining after a couple of minutes and the filter caps are running stupid hot. Also some issues with channel 1 attenuator.  Second one I haven’t even cracked open yet. Lots of fixing fun to do.
--- End quote ---
Yeah they're pretty easy to work on thankfully.


--- Quote ---Calibration fixture is a “raw” input plugin for the horizontal amp. Basically it just has a BNC and buffer that allows you to deliver a signal to the X amp directly.
--- End quote ---
Never seen or hear of one.....but it's been a while since I had or studied a D83 manual.


--- Quote ---I’ve seen the 465 multiplier rebuild. Might have a bash at that. Will get some microwave oven diodes off aliexpress :D
--- End quote ---
IIRC you'd just use the same spec as those in the DC restorer and I think I got some from RS....I did and just looked.....629-8691 = GP02-40 = 4KV 250mA


--- Quote ---Hours of fun ahead. Will post some photos later if I get a few minutes.
Honestly I’m going to have to rebuild one of these from scratch by the looks and QA each board properly. Might take a while. It’s the learning that’s interesting though :)

--- End quote ---
Looking forward to them but maybe it's worthy of their own thread.......for mums sake.  ;)

tautech:

--- Quote from: bd139 on May 19, 2018, 08:48:21 pm ---Quick picture. Note the replaced labels (the other plugin fascia is better so I will swap it) and the replacement timebase knob someone made (I have someone who will send me a real one).

Original capacitors. Nice sharp trace.



--- End quote ---
That pic looks photo-schopped and the trace green  :-//, is it missing the blue CRT filter ?

Looks like she's served someone well as the labeling is worn completely away.  :o  :scared:

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