- Amps [BG]
|trompeta ||01-15-2014 02:23 PM |
I need schematic ampeg B15-R
|nashvillebill ||01-15-2014 02:27 PM |
I thought I had the schematic, but can't find it, sorry.
The bigger question though: what burnt everything up? Resistors normally don't just burn up. Looking at the picture somewhere a massive amount of current must've been drawn through them. Before replacing them, it's critical to find out the root cause. Power tube failure?
All that carbon on the circuit board is not good either, can cause future arcing. A thorough cleaning to bare board is necessary.
|trompeta ||01-15-2014 02:33 PM |
yes, a power tube failure and something more
|trompeta ||01-15-2014 02:36 PM |
Already this repaired and clean, but i cannot find schematic in the web
|beans-on-toast ||01-15-2014 02:38 PM |
R66, R67, R68, R69 are power tube screen resistors 470Ω, 5W, 10%. They should be flameproof.
R71 and R72 are 100Ω, ½W, 1% resistors. The artificial center tap for the heater. These act like fuses and blow if there is an issue with the tube heater circuit.
I would change them all. Clean up all the char with isopropyl alcohol.
You should be able to obtain a copy of the schematic by contacting email@example.com
|trompeta ||01-15-2014 02:48 PM |
Thanks a lot. I will follow your instructions. Thanks again.
|BassmanPaul ||01-15-2014 02:52 PM |
Originally Posted by beans-on-toast
Clean up all the char with isopropyl alcohol.
If the Char doesn't like that, buy her a Martini instead! :D
|beans-on-toast ||01-15-2014 02:55 PM |
They aren't usually that picky. Anything that they can get their hands on suits them fine.
|beans-on-toast ||01-15-2014 05:02 PM |
In England, a charwoman usually looked something like this.
Not to be confused with a tealady
Never to be confused with Charo.
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