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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Crate BV150H tube/valve amp
According to owner , bought it off company rep a few years ago and is export
version prototype. Blew a fuse a few weeks back , runs still ,after fuse change (self heeled cap?) but excessive hum. 450V rating ps electros but I measure 488V on the HT rail and varying ac (4 to 5 volt ac measured via 1uF, 1500V polyprop), perhaps seriesed-up, but 3 in there, I've not taken apart yet. The neon lit mains switch looks more like a light bulb , runs too hot to keep your finger on, I suspect droppers for USA mains inside. No serial number on the chassis. Have yet to test the valves but I suspect probably ok, any advice on dealing with the HT/caps issue? What is the HT rail supposed to be for USA issue ones ? Any schematic for the pa / ps anywhere ? |
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