Steenamaroo
...
Hi all,
I've been landed with a Hotrod Deville 212 for repair.
It was stored for a few years and powered up yesterday by the owner.
It played well for about 10 minutes and was (foolishly) left on and unattended for a further ten.
On return there was smoke seeping out of the back.
Anyway, one of the power valves is well and truly blown and the PCB surrounding the valve is pretty well charred.
R59, R60 and R65 and the obscured diode don't seem to be damaged - Just marked.
I'm cleaning it up now for a better look but I wanted to ask, is the blown valve likely to be a symptom or the cause?
I'm not valve-experienced at all, although I'm well aware of safety procedures!
A picture says more than words.
Any and all thoughts are appreciated.
My thoughts, purely on first visual inspection, are that the valve blew and there was a massive current draw through the main burned out resistor? Most of the black is surface marks but under the resistor it's char.
Is this plausible?
It might also be worth noting that the main charred resistor was no properly soldered in. Both ends are crimped/bent on the other side of the board, but not soldered. I can wiggle it quite freely, but I don't know how free it was before hand.
The plan is replace the tube (pair??), replace the charred resistor, and test/bypass damaged traces.
Seem reasonable?
I've been landed with a Hotrod Deville 212 for repair.
It was stored for a few years and powered up yesterday by the owner.
It played well for about 10 minutes and was (foolishly) left on and unattended for a further ten.
On return there was smoke seeping out of the back.
Anyway, one of the power valves is well and truly blown and the PCB surrounding the valve is pretty well charred.
R59, R60 and R65 and the obscured diode don't seem to be damaged - Just marked.
I'm cleaning it up now for a better look but I wanted to ask, is the blown valve likely to be a symptom or the cause?
I'm not valve-experienced at all, although I'm well aware of safety procedures!
A picture says more than words.
Any and all thoughts are appreciated.
My thoughts, purely on first visual inspection, are that the valve blew and there was a massive current draw through the main burned out resistor? Most of the black is surface marks but under the resistor it's char.
Is this plausible?
It might also be worth noting that the main charred resistor was no properly soldered in. Both ends are crimped/bent on the other side of the board, but not soldered. I can wiggle it quite freely, but I don't know how free it was before hand.
The plan is replace the tube (pair??), replace the charred resistor, and test/bypass damaged traces.
Seem reasonable?
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