Bummer!! Two questions. What were you doing when it happened and what insulators do you have under the output transistors ( cant see any )?
Hi.....AMP worked perfectly other than little low gain,I checked bias voltage of Q24 and suddenly fired and burned all components in + rail up to Q13,please give suggestions for causes?
Actually more questions. Do you carefully check the drill holes for burrs before you mount transistors on the heatsink, and do you check that the collectors are not shorted to the heatsink after you've mounted them?
All were in correct order......
I think amplitude is probably right as to the likely cause of your burnout. I used 51R with no problem in my amps. I'd replace all four 49.9R resistors with 51R types - the absolute value isn't too critical but its important that all four values match as closely as possible ( or reasonable! ).
Are you worried it's fake?
My first impression is it looks like the real thing, I found a thread that deals with fake mjl21193/94 with pics.
One could measure them and see if they match spec sheet data.
https://www.google.com/url?sa=t&sou...Vaw2GGC3uD7jVDZuOxfR6HHm8&cshid=1579845761292
My first impression is it looks like the real thing, I found a thread that deals with fake mjl21193/94 with pics.
One could measure them and see if they match spec sheet data.
https://www.google.com/url?sa=t&sou...Vaw2GGC3uD7jVDZuOxfR6HHm8&cshid=1579845761292
Looks like mine too. Marking says made in Singapore in 2017 work week 12. Who did you buy them from?
Hi...thanks for your reply I’m a Sri Lankan..which is a small beautiful island like a paradise situated in Indian Ocean .I bought them form Colombo ...the capital city of the island.And I’m a medical doctor with little knowledge in electronics but suffering with fever.Oh ...that is myself....really ? it’s look like original ? but I saw some discussion in forum that original one is rectangular and no projections at base of pins ?.
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