22nd Jul 2021, 11:58 am | #21 |
Dekatron
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
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Re: Bush VHF61
Many of the Hunts capacitors are in decoupling positions where some leakage would not prevent the set from working. However, they are renown for failing in use so I replaced all of those in my VHF61 as I planned on using it regularly. There are quite a few decoupling the heaters and if they go leaky they will overheat until they self-destruct.
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29th Jul 2021, 1:14 pm | #22 | |
Dekatron
Join Date: Nov 2009
Location: Lincolnshire, UK.
Posts: 5,000
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Re: Bush VHF61
Quote:
I did a little experiment with a Bush radio a while back where I lifted one end of a potentially leaky screen grid wax de-coupler and tacked in a new replacement and it made less than a volt difference to the HT screen voltage (fed through the relatively high value resistor in the circuit) and no effect on performance at all. I do accept that not all radios are the same and there are certainly cases where capacitors that become excessively leaky can pull that voltage down causing performance issues and I myself have replaced bad examples for this obvious reason, so replacing them anyway may not be a bad idea. |
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