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Ahh, I must have the resistors mixed up. I thought you were talking about the 100 ohm 5 watt that attaches to the 470r on the small turret board across to the other turret board. I misread the post.

That's interesting Mark. When I replaced the 100r resistor my supplier had none available in 5W, so I put a 10W in there instead. After reading your post, it seems like I'm defeating the purpose and should get my hands on a 5W version of it and replace it. Oh and PS, I put in a new Quad of =C= from ...

Of course you are correct. It's funny to know that both these amps which were bought in N. America came with the fuses 3A/1A.

Ahh me, the second one was just the fuse. It was incorrectly loaded with 3A and 1A fuses as opposed to 6A/3A for use with 120v.

Good News!

Replacing the resistor worked. Thanks for all the help. Now one more head to fix. If it's the same issue, I'll really be wondering what the heck happened. I'm afraid to use the hot plate now...

Odd, the 100R 5 watt cement resistor is measuring 700K. Could that be the culprit?

Okie doke... Measuring the primary I get about 43 ohms, measuring on each half o the primary I get about 21 ohms, Sounds okay. I'm a little confused about the secondary. If I measure from the 16 Ohm tap to ground (chassis) I get something like .8 Ohms. If I measure from pin 3 of the OP tube to the 1...

Yeah first thing. Thanks for the xformer tip, I'll check it today.

Well, bad luck.

I re-tubed the EL34's, recapped the head and replaced the burnt resistor. Still no audio. All tubes are glowing, just dead silence. I'm worried about the OP xformer. How can I test for that?

The cabinet is good. I've been running a JTM 45 on without issue. The cables I'm not sure. I knew we had a bad one but I tied it in a knot and put it away... I'm wondering if it somehow got mixed in by someone else without me knowing. I'll open up the second one tomorrow to see what I find. Again, t...

Thanks for the reply Dave. I just noticed the spuzz on the filter cap - I don't know if the cap itself failed, but it's as old as the amp. The other head that blew has new filter caps so I'll be able to tell if this failure is doing something to the cap as well. The burn resistor (the yellowish one)...

Hi fellas, some advice appreciated. The situation. While running a dr103 through a THD hot plate with channels jumped I heard a cackle then dead, no sound. Fuses all good. But since I was in the middle of a session with no time I just put another dr103 on and within 20min, the same thing happened. S...

Ha! Me too, but there IS a rivet on the other side

Date codes all match though...

are you sure? according to mhuss' site 6A & 3A are for 120V. 3/1 is for 240V

Here's something that makes you go hmm on this '72 I bought. Yesterday we were using it on a recording session and after about 10 minutes of loud heavy playing the mains fuse would pop. Without paying much attention I put another 3A fuse in, and then proceeded to blow that one as well. Whomever tech...