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10-18-2024, 11:11 AM
Hey Physics
I wouldn't jump right to replacing caps yet; that is an easy cash grab techs do particularly when they do not know what is wrong with the amp.
The amp is a simple MV 800-style with a rather spacious chassis. If online photos are to be believed the MV is a standard type, although by that time some models used a PPI-MV with a dual pot - terrible for clean sounds.
As far as "no sound" goes, there are lots of reasons for that. The most expensive ones to rule out (easily) are an open OT or open speakers. You can check both with an ohmmeter and the amp unplugged and caps discharged. More typical reasons are cold solder connections, oxidised jack contacts, dirty pots and similar things.
If you intend to keep the amp, adding proper bias controls and meter jacks would be the first mod to do. It allows you to use alternate tube types and to mix tubes, plus easily set the bias to a safe level for any tube and hum-balance the output stage. BMK2 as our kits go, or get the parts from the usual places.
It would be handy to have a power limiting safety socket for the electrical testing
Have fun
I wouldn't jump right to replacing caps yet; that is an easy cash grab techs do particularly when they do not know what is wrong with the amp.
The amp is a simple MV 800-style with a rather spacious chassis. If online photos are to be believed the MV is a standard type, although by that time some models used a PPI-MV with a dual pot - terrible for clean sounds.
As far as "no sound" goes, there are lots of reasons for that. The most expensive ones to rule out (easily) are an open OT or open speakers. You can check both with an ohmmeter and the amp unplugged and caps discharged. More typical reasons are cold solder connections, oxidised jack contacts, dirty pots and similar things.
If you intend to keep the amp, adding proper bias controls and meter jacks would be the first mod to do. It allows you to use alternate tube types and to mix tubes, plus easily set the bias to a safe level for any tube and hum-balance the output stage. BMK2 as our kits go, or get the parts from the usual places.
It would be handy to have a power limiting safety socket for the electrical testing
Have fun
