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Old Yesterday, 5:23 pm   #21
60 oldjohn
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Default Re: Bush vintage radio DAC90A.

[QUOTE=Paul_RK;1406998]
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Originally Posted by 60 oldjohn View Post
in which case there aren't any retaining screws for the front knobs and they do pull off. Rotate one of them while shining a torch through the nearest hole underneath and you'll soon see whether or not a screw is used.

Paul
Hi Paul, You learn something every day. Are these the knobs with perspex inserts ? I've seen plenty DAC90/A knobs with chips from attempts to lever the knobs off.

John.
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Old Yesterday, 5:30 pm   #22
merlinmaxwell
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Default Re: Bush vintage radio DAC90A.

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test valves first
Why? Most valves are fine and where to test? (If I wanted to test a valve it would require a bit of a ride to Gerrys to put them on his tester) With a meter any dodgy valves will be obvious, if there are any. I have only had one properly dud valve in all my restorations.
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Old Yesterday, 5:34 pm   #23
Glowing Bits!
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Default Re: Bush vintage radio DAC90A.

The reason for testing is incase I need to buy a new one, it allows time to do the rest of the work.
I have a basic emissions and shorts tester which showed a fault with a valve in a DAC90 without the A, it had no cathode!
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Old Yesterday, 5:37 pm   #24
kalee20
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Default Re: Bush vintage radio DAC90A.

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Why? Most valves are fine … With a meter any dodgy valves will be obvious, if there are any. I have only had one properly dud valve in all my restorations.

I'd agree, valve faults are rare in radios, and in-circuit measurements will reveal if there is a problem.

Just treat each valve as another circuit component, albeit one which is less likely to be faulty (which means you'd suspect other items ahead of the valve).

Last edited by kalee20; Yesterday at 5:37 pm. Reason: fixed quote
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Old Yesterday, 5:53 pm   #25
ms660
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Default Re: Bush vintage radio DAC90A.

UL41 anyone.

Lawrence.
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Old Yesterday, 6:11 pm   #26
Radio Wrangler
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Default Re: Bush vintage radio DAC90A.

I see your UL41 and I'll raise you ECC85! But there isn't one of those at least in a DAC90.

There are relatively few famously short-lived valves. Who knew, back in the days of new sets, when valves were specifically excluded from warranties?

David
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Old Yesterday, 6:23 pm   #27
ms660
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Default Re: Bush vintage radio DAC90A.

Back in my TV servicing days, at least the Mullard top ten/twenty were in my service van.

Lawrence.
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Old Yesterday, 8:18 pm   #28
Paul_RK
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Default Re: Bush vintage radio DAC90A.

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Originally Posted by 60 oldjohn View Post
Hi Paul, You learn something every day. Are these the knobs with perspex inserts ? I've seen plenty DAC90/A knobs with chips from attempts to lever the knobs off.

John.
Hi John,

Yes, I've never met screws on the last generation of DAC90A front knobs, those with the perspex backing disc. I've a feeling screws were used on the intermediate knob type, the chunky ones that don't taper toward the front: probably I've a set that uses them hiding somewhere, but can't at present find one to check.
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