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Post by Chris on Jul 8, 2014 4:23:39 GMT
My amp is a heavily modified Bewitch. It's had the Lampizator mods done to it and as part of that it's hard wired into triode mode.
I would like to have the Ultralinear mode reinstalled and will be taking it into a shop to get the work done as well as a minor health check - how much should I expect to pay for a wee job like this?
I'm going to be taking in the circuit diagram so the blokes got a better idea of what he's dealing with.
As always,answers much appreciated.
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Post by Firebottle on Jul 8, 2014 5:46:34 GMT
Well that's not much of a job, just swapping a few connections around. Might have to fit some new wire if the tappings on the output trannie are tags, rather than flying leads. If it's a minor health check, HT voltages, bias levels, visual for failing components, then I'd say 2 hours tops.
Hope this helps,
Alan
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Post by Chris on Jul 8, 2014 19:03:35 GMT
Cheers firebottle.
Anything else worth doing whilst it's opened up?
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Post by Firebottle on Jul 9, 2014 5:59:38 GMT
I'm just wondering from your question whether the shop you mention taking it to has experience with valve kit. Interesting looking amplifier, particularly as originally the triode/ultralinear mode was switchable. For absolute peace of mind either look at the voltage on R11 & 12, it should be zero, or disconnect one end of C3 & 4 and check for leakage, again should be zero. As the amp is built on a pcb it is easy to give all the components a visual check, any signs of thermal stress should be investigated. Here are the Lamizator details for anyone interested lampizator.eu/AMPLIFIERS/CHINA/bewitch%206550/Bewitch.htmlCheers, Alan |
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Post by pre65 on Jul 9, 2014 9:33:45 GMT
Given your location, it might be worth contacting Philip Ramsey at Bluebell Audio.
www.bluebellaudio.com/
Give him a ring and explain your needs, he's a nice man to deal with.
NB I have no connection with Bluebell other than as a satisfied customer.
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Post by Chris on Jul 9, 2014 18:44:35 GMT
Thanks again fellas - I will take this into the bloke.
Pre65 - Bluebell are supposed to be very good but a wee bit too far away. I've used Colin Hood Audio before and he knows what he's doing but I'm giving another shop a try as it's a bit closer.
Firebottle - have to say I was a bit surprised when he said yes on the phone! Fingers crossed as it'll be really handy if he's good.
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