Valve amp repairs

[Idlewithnodrive]

I know this has been asked before and I've done a quick forum search but can't find a relevant answer.

Evening all.

The output transformer on my Border Patrol 300B Power Amp seems to run ridiculously hot, as in you can't leave your finger on it for even a second (I know, why would I want to do that ? ) and after about 30 minutes there is a whiff of rather warm (not cooked) electronics.

So, I'd like somebody knowledgeable to take a look at it for me. I'm based in Luton, Beds (J10, M1) and happy to travel an hour and a half'ish each way.

Any suggestions appreciated.

 

[It Cost How Much!?!]

Graham in Didcott (Valvebloke), but he is super busy.

 

[Idlewithnodrive]

Graham in Didcott (Valvebloke), but he is super busy.

Yeah, I don't think he's talking on anything new.

 

[audio_PHIL_e]

Too much current through the OPT primary? Hmmm ... what colour is the o/p valve anode? Has its bias gone awol? What's the sound like?

 

[Idlewithnodrive]

Too much current through the OPT primary? Hmmm ... what colour is the o/p valve anode? Has its bias gone awol? What's the sound like?

Quite Red. Sounds wonderful, no hum, so ..... ?

 

[audio_PHIL_e]

I'd guess (from a hot OPT and a red anode) that the o/p valve is passing way too much current which may in turn imply that its bias has gone awol. That is (afaik) less likely with cathode-bias, but could happen with grid-bias either via a severed connection from the bias supply to the grid, or because the bias supply has failed. I'd also suggest the symptoms are Not Good for the OPT or the o/p valve, and that you should find a substitute amplifier and/or get yours fixed asap.

 

[Idlewithnodrive]

I'd guess (from a hot OPT and a red anode) that the o/p valve is passing way too much current which may in turn imply that its bias has gone awol. That is (afaik) less likely with cathode-bias, but could happen with grid-bias either via a severed connection from the bias supply to the grid, or because the bias supply has failed. I'd also suggest the symptoms are Not Good for the OPT or the o/p valve, and that you should find a substitute amplifier and/or get yours fixed asap.

The Amp has been stood down for the last couple of weeks, so no chance of any further damage being done.

.......... hence my post here

 

[Psilonaught]

http://www.essexamprepairs.co.uk

They are an official Icon Audio repairer but can service any valve amp. I have used David a few times and he is brilliant, and relatively fast (2-3 weeks).

Google maps suggest he is just over 1 hour from Luton

 

[andya]

I know this has been asked before and I've done a quick forum search but can't find a relevant answer.

Evening all.

The output transformer on my Border Patrol 300B Power Amp seems to run ridiculously hot, as in you can't leave your finger on it for even a second (I know, why would I want to do that ? ) and after about 30 minutes there is a whiff of rather warm (not cooked) electronics.

So, I'd like somebody knowledgeable to take a look at it for me. I'm based in Luton, Beds (J10, M1) and happy to travel an hour and a half'ish each way.

Any suggestions appreciated.

Deco Audio in Aylesbury will repair and service valve amps. Sorted my Audio Research Classic 30 for me at a reasonable cost.

 

[Lurch]

Henry @toprepairman could sort this for you he's Fetcham/Leatherhead.
PM me for his phone number.

 

[Idlewithnodrive]

http://www.essexamprepairs.co.uk

They are an official Icon Audio repairer but can service any valve amp. I have used David a few times and he is brilliant, and relatively fast (2-3 weeks).

Google maps suggest he is just over 1 hour from Luton

Thanks for that, I didn't know of them.

 

[Idlewithnodrive]

Deco Audio in Aylesbury will repair and service valve amps. Sorted my Audio Research Classic 30 for me at a reasonable cost.

Yes, I know Peter and Co. I'm not sure how reasonable their charges are though.

 

[Idlewithnodrive]

Henry @toprepairman could sort this for you he's Fetcham/Leatherhead.
PM me for his phone number.

Thanks for the suggestion, but I'll pass on that.

 

[toprepairman]

Thanks John for the recommendation.
By sheer chance I'll be in Luton on Wednesday delivering the Mrs to the airport.

 

[audio_PHIL_e]

By sheer chance I'll be in Luton on Wednesday delivering the Mrs to the airport.

Pleasure trip?

 

[toprepairman]

Babysitting grandkids whilst DIL is in for a hip replacement, no fun.

 

[Sotosound]

I know this has been asked before and I've done a quick forum search but can't find a relevant answer.

Evening all.

The output transformer on my Border Patrol 300B Power Amp seems to run ridiculously hot, as in you can't leave your finger on it for even a second (I know, why would I want to do that ? ) and after about 30 minutes there is a whiff of rather warm (not cooked) electronics.

So, I'd like somebody knowledgeable to take a look at it for me. I'm based in Luton, Beds (J10, M1) and happy to travel an hour and a half'ish each way.

Any suggestions appreciated.

Deco Audio in Aylesbury. James is a top class technician. Why not give them a call?

 

[Idlewithnodrive]

Deco Audio in Aylesbury. James is a top class technician. Why not give them a call?

Yes, I'm going to do that.