22nd Apr 2021, 9:54 am | #21 |
Octode
Join Date: Oct 2019
Location: Stockport, Greater Manchester, UK.
Posts: 1,611
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Re: Regentone
It would be interesting to hook up the scope along the same signal path in the RF/IF stages to try to identify where the signal loss is occurring. Alternatively you can use another radio, usually a portable transistor, to find out if the oscillator is working.
I'm sure you know all this already. Let us know where the fault is. As I mentioned earlier, they do work well and sound good too. Good luck Last edited by Gabe001; 22nd Apr 2021 at 10:12 am. |
22nd Apr 2021, 3:52 pm | #22 |
Nonode
Join Date: Dec 2012
Location: Bocking, near Braintree, Essex, UK.
Posts: 2,068
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Re: Regentone
Hi Gabe001
I did hook up a scope and there is around 100m/v of signal from the oscillator, I am suspecting that either the EF39 is going down as the set warms up or the triode section of the ECH35 is going down. But when the sound has dropped, placing a finger on the grid of the EF39 will bring up the sound. Peculiar fault this, I will get there in the end. Regards Ken |
23rd Apr 2021, 6:45 pm | #23 |
Nonode
Join Date: Dec 2012
Location: Bocking, near Braintree, Essex, UK.
Posts: 2,068
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Re: Regentone
Hi Folks
I knew I would win with this set in the end, I traced the fault back to the ECH35 it was the Triode section of that valve which caused all that bother, apart from a 10k resistor reading 1k higher than it should on the output valve. Now for the cabinet, get all that grime off and polish it. Regards Ken |
23rd Apr 2021, 8:33 pm | #24 |
Octode
Join Date: Oct 2019
Location: Stockport, Greater Manchester, UK.
Posts: 1,611
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Re: Regentone
Well done.
Your cabinet doesn't look too bad to start with. |