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It went really well, I took all the advice I was given, decided to change the valve sockets for ceramic ones which made it look a little more sophisticated! However, one fault I could not fix is, when you flick the switch from 100w to 50w on the back of amp switch, the amp will not work apart...
Geez ah break Fastdave. I'd loved to have gone to Uni, but circumstances you know.
I'm a diy'er with common, and you know, some people have a lot of common but no sense!!!
I'm a quick learner especially when it's a subject that you've loved since you were knee high. It never gets boring...
I've just received my 4 new EL34 sockets and will install them. It is really of no use asking me anything technical. I have took my guidance from all of the brilliant techs above, including earlier on the "check the socket for arcing". I had the amp running for an hour before doing final...
sorry RussBert. with the loose tubes I was getting erratic reading. Now i realize that, i will remedy it. The readings I have listed above, are made after the amp was turned on for about an hour, fully warmed up. I checked and double checked.
Hope that makes a bit more sense. I swapped the...
OK. Here's what I've done. While it was turned on and I was probing for voltages on V5, the amp started making a terrible rustling crackling sound, and stopped when I pressed pin 5, the green wire. Just to make sure, I jiggled the wire again, and sure enough it started up again, it sounded like...
If this doesn't help I will try my hardest to get a picture..very difficult.
What is the definitive answer that tell you my amp is definitely an EL34 model?
Green wire comes from mains transformer pin 5, links to both capacitors and then to GN5 on pcb.
Cap 1
(+ post red) Red wire to...
Here you go....Jon, you must ask me things in simple to understand directives.
As you can see along the way, I have had some great advice, and managed to get the amplifier working with sound....of which it sounds great.
So, I put the orange wire on the wrong pole to start with, I soldered it...
Hi Jon.
It is definitely an EL34 board and I have 34's in it. I've got 2 new filter caps and 4 new screen resistors in. I can't get the bias below 54mV. Do you think there's a possibility I may have to replace some of the other electrolytics?
I'm using the proper octal bias probe to measure.