Loudthud
those diodes worked a treat
many thanks
have a great xmas & avoid covidiots
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Doh...
I will try this tomorrow night
Thanks for your suggestion
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Stupid question on LM7812
Dear fellow MEF's
I have been using the LM7812 (etc) for about 30 years and never come across this problem.
The LM7812 IC2 refuses to start and...
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Here are some pics of the amp http://www.voxshowroom.com/uk/amp/mv.html
It uses one of those nutube things....
I would be worried about 18.9V...
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IC24 replaced, Q23 replaced....
Are + & -15V supplies ok when input signal goes into the red
Is the +5V supply ok when the input signal...
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You could always try MJE340 & MJE350 300V 0.5A 20W hfe maybe around 100 at the operating point in this amp
Also BF469 & BF470 250V 0.1A...Last edited by mozwell; 04-18-2018, 06:55 AM.
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Often the caps are added so the complete unit can pass EMC compliance certification. In Au its mandatory for electrical equipment, and often with linear amps,...
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Also, be aware that a lot of stomp boxes operate from a 9VDC supply, and many have a reverse polarity diode across the power supply input. You can NOT use...
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carbon can get noisy (it has happened to me, i had to replace 1W carbon resistors with metal film, as i got nopise from the first gain stage anode resistor),...
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I am not familiar with this unit, but....
There seems to be an internal 6x AA battery pack, presumably on connector CN3
There are two...
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here is what i have for ELK, but they are all for tube amps, not Solid State
You could try http://drtube.com/en/library/schematics/59-elk-schemas...
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sch attached
PSU is on page 14
Connector is X84
Pin 1 is +15VDC
Pin 2 is -15VDC
Pin 3 is 0V (A for Analogue section ?)
...
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