Hints and tips on getting the sound you want. Includes anything to do with Fender, Burns and other guitars; playing techniques; also amps, effects units, recording equipment and any other musical accessories.
Moderators: David Martin, Iain Purdon, dave robinson, JimN, George Geddes
by ecca » 19 Mar 2011, 10:08
Marshall JTM 60, 12 years old has suddenly started blowing the HT fuse sporadically, 500mm slo blo.
I replaced the EL34s with 2 Harmas from Watford, it still does it.
The HT voltage is 493 VDC with nothing being played.
I suspect the HT smoothers which are rated at 550VDC but the only ones I can get are 500VDC which I don't think is enough headroom on the working voltage.
Any ideas ?
I've asked Amanda, she's probably still in bed.
Cheers
Ecca
-
ecca
-
by ecca » 19 Mar 2011, 16:54
Thanks Dick, useful tips and great links.
-
ecca
-
by David Martin » 21 Mar 2011, 17:34
Ecca: Just call the Marshall service dept and make an appointment to go to MK. They will fix it while you wait and guarantee the work too... Fantastic service...
"All Marshall service work in the UK is carried out at the Marshall factory in Bletchley. We do not have any other service engineers or centres based in the country. To have your amplifier serviced we can arrange collection from a business address, you can make an appointment and have it looked at while you wait or you are able to leave your unit with us. Please contact our Returns Department on 01908 375411 if you would like to arrange collection or make an appointment. You will be contacted with a free quote before going ahead with any repairs but we cannot give an estimated cost before seeing the amplifier. There will be a carriage charge if our couriers collect and return your amplifier and this will need to be paid regardless if you go ahead with the repair."
David M
-
David Martin
- Site Admin
-
- Posts: 1442
- Joined: 08 Sep 2009, 16:48
- Location: Lincoln
-
by Mark Burton » 21 Mar 2011, 17:49
Amanda's woke up now but busy in the General section .....
Mark Burton
-
Mark Burton
-
- Posts: 329
- Joined: 17 Sep 2009, 10:18
by ecca » 23 Mar 2011, 17:10
The capacitors are impossible to get.
I've ordered some 100uf @ 350VDC to put 2 in series to get 50uf @ 700VDC.
-
ecca
-
by neil2726 » 24 Mar 2011, 00:55
Its probably full of crumbs from all those cobs!
-
neil2726
-
- Posts: 1032
- Joined: 16 Sep 2009, 15:36
by ecca » 24 Mar 2011, 13:19
My amp never goes out of doors these days, I use the wonderful Ampworks into some bugger else's amp.
-
ecca
-
by Amanda » 24 Mar 2011, 22:56
Ecca Wrote:
"My amp never goes out of doors these days, I use the wonderful Ampworks into some bugger else's amp."
Yes- for the last two weeks my fiery little Pro Junior Copy - boy is it loud, and if it will withstand Ecca then it's bomb proof
I'm now registered with Marshall as an approved service tech, allowing me access to spares and service manuals.
-
Amanda
-
- Posts: 952
- Joined: 12 Sep 2009, 11:55
-
by ecca » 25 Mar 2011, 12:46
Capos fitted..... HT 493 VDC.......... see how it goes.
-
ecca
-
Return to Guitars and Gear
Who is online
Users browsing this forum: No registered users and 63 guests