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Success Stories If you have successfully repaired or restored a piece of equipment, why not write up what you did and post details here. Particularly if it was interesting, unusual or challenging. PLEASE DO NOT POST REQUESTS FOR HELP HERE!

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Old 5th Jun 2011, 6:28 pm   #1
Cre8anet's Avatar
Join Date: Nov 2005
Location: Banbury, Oxfordshire, UK.
Posts: 145
Default Return of Cossor 1049... (second installment)

..more Monster-'scope discoveries, specially for any Cossor or 1049 fans:

See pics and thanks again to Ken, who also provided resources towards fix
(BTW, these go with the running success story here:

(1) alternative to v22?? (a bit whacky, I admit) Cossor seemed keen on the 61BT tube. Yet to find easy replacements! (unless I want to waste EL38's with 3X power-handling). With little to lose, I spotted 6BQ6 has decent plate-volts (hurrah!).. but almost 2x I-fil (boo)...

So I tried 12BQ6 just for fun (yes, I know, a 12V tube in place of a 6V one... but I always did prefer experimental physics to precision engineering).

Results are so far so good in v22, but perhaps I should try swapping v15 this way instead... on basis it pulls less current?? Will keep you posted

(2) More gone-hi carbon power resistors. This time, to my surprise, both 15W glazed 56K's gone o/c. Both identical. These are R77 and R79, so result was no A1 trace. Now trace almost restored.. just too far -ve, so more resistors gone-hi I expect.

(3) Same again, EHT arcing is still a problem. Cotton-buds and meths must come out again but it's a bit hit and miss!

(4) Yet again, all caps seem fine... once again the famous Cossor electrolytic-less scope wins-out in this round.

Bottom line: if you restore a cossor of this era, expect to replace a LOT of fat carbon resistors. (See also first installment in link above).

Have fun!

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