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Hello...Just found that a cap had a broken leg.... Just had to résilier it properly and the amp is back un bussines!


Note: tonight my DR103 Blown. main fuse went out suddenly

hello unfortunately there's no sign of arcing on the tubes...

Could it be a fault in the output transformer?

Hello yes we tried with the chassis on top of the combo...the noise is there . Mostly because of vibration I think

I'm puzzled too!

Hello to all. I'm calling for help. It been a month since I try to find the case of a big Crackling noise on certain notes, mostly low ones. To this day we already done the following job with the help of sometimes a friend sometimes a lopper playing the 'deadly' notes or chords: Cleaning every mecan...

Finally put it back in the since the reading on the multimeter was wrong.

Seem to been an 'cold' joint inside the circuit, the amp is working correctly now, linking the channel is OK.

It is normalt tha the bright channell seems to be a little less powerfull than the normal One?

That big boy gone up to 250nF

Here's what I do... as for the others Hiwatt I got

Yes I did. I changed every tubes in there without success

Yes. no matter how I connect when an input is connected to 'low' ...the output is 'low'.

I should mention that I found brillant Input is 'kind' of weaker than the normal one.

That's why I was asking...didn't see anything wrong too

I just saw that the middle pot value is wrong...50K instade of 100k...

Here you are sir, As you can see the 'middle' pot has been changed also 1 tone stack capacitor for bass was return to original mullard at 47n INPUT JACKS 20210826_145932.jpg 20210826_150005.jpg TAG BOARD 20210826_150018.jpg 20210826_150055.jpg As you can see this amp is late 1970 (at least october) ...

Hi to all It's been a month since got my new 1970 DR103, serial number is 1083. It is original exept for a recap an bias doubler mod. I come to you because think something is wrong. when I link brilland on the low input and normal channel ther's a significant volume loss. that doesn't happen on my S...

Amp is working again !

There was just a broken wire ... the HT1 connexion to the output tranny. HERE




I wonder how this happen

Thanks.

Fuse have been tested ok

Could it be a préam tube? PI?