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Last Post by Anonymous 9 years ago
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 sideband
(@sideband)
Posts: 4268
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Whilst I was checking the set again, I was aware of rustling noises that could be cured by tapping the EBL31. It's done ths a few times in the past and I thought it was dirty contacts. This valve had already been changed for a good (supposedly) used sample.

Anyway this time I found that the noise could be made to come and go almost at will by touching the top cap connector. I noticed that the connector was slightly loose. It was gripping the actual valve connector OK but the rivet connecting it to the solder tag was loose. I found the best way to cure this was to run solder all around connector between it and the solder tag. Instant cure, no more rustling noise...I wonder if the original EBL31 will now work OK?

Forum 1

The top cap connector showing the loose rivet

Forum 2

The repair.

SB

 
Posted : 29/08/2011 12:54 am
 sideband
(@sideband)
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I wonder if the original EBL31 will now work OK?

...yes it does..! I like to keep as many of the original valves in the set as possible so it's only had the reccy replaced. Not bad for 65 years old.

SB

 
Posted : 11/09/2011 11:11 pm
 sideband
(@sideband)
Posts: 4268
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I didn't realise nearly 5 years had passed since I last posted anything about this set! :ccf

Well it's been sitting by the side of the bench slowly gathering dust but to be fair I have powered it up a couple of times for a few hours. No reason for the stalled restoration other than different sets that come along and take my interest. Anyway electrically the set was completed barring the replacement of a smoothing capacitor with something more in keeping with the original which had been removed at sometime in the past. At the moment I'd temporarily wired in a 47uF on a piece of tagstrip.

A month or so ago I ordered same rather nice 32uF 500V bolt-in caps from Ask Jan First. One went in to my Philips 206A, the other was destined for this 170A and tonight was the night it was finally fitted. Out with the temporary 47uF and in with the new 32uF which fills the vacated hole very nicely. I'd also (last year) fitted a good used EM34 which, although not perfect, presents a very acceptable display.

So now I can say that the electrical work really is finished and all I have to do is replace the torn speaker fabric and then try and remember how it all goes back together.... :aab

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Posted : 21/08/2016 12:55 am
 Anonymous
(@anonymous)
Posts: 16844
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Its funny how some restorations get put to one side as new and interesting toys come your way, and they just have to be looked at and tested. Then you just have to try "that" to see if that cures a fault, then try "this" and then "something". :qq1

Mike

 
Posted : 21/08/2016 10:17 am
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