Sunn Lead Concert Service and new Transformer for UK

Sunn Concert LeadSunn Concert LeadSimple amp sounds great!Simple amp sounds great!DSC_9535Mmmm was 110 V model and someone has added a rather two small "autotransformer"Mmmm was 110 V model and someone has added a rather two small “autotransformer”should be at least 400 VA.. and after the switching..should be at least 400 VA.. and after the switching..sinsolations tape... lovely job..sinsolations tape… lovely job..DSC_9539Always love this sign!Always love this sign!DSC_9542some dust here!some dust here!DSC_9544Auto transformer too close to preamp board for comfort...Auto transformer too close to preamp board for comfort…Mmm no earth...Mmm no earth… Looks like new screws on the transformer..Looks like new screws on the transformer..DSC_9548bit bent looking..bit bent looking..DSC_9550DSC_9559DSC_9560Love the cloth England sign!Love the cloth England sign!DSC_9562Welded on fixing points.. this has suffered a big break at sometime!Welded on fixing points.. this has suffered a big break at sometime!All clear and a fuse holder added for UK supply. Just needs a nice new Toroidal transformer and she will sing sweetly again!All clear and a fuse holder added for UK supply. Just needs a nice new Toroidal transformer and she will sing sweetly again!New Toroidal Transformer in with +/-25 volt outputNew Toroidal Transformer in with +/-25 volt outputDSC_9819DSC_9812Ooops will not fit with the power supply caps positioned as they are..Ooops will not fit with the power supply caps positioned as they are..Pot rivets holding the cap holder in place need to be drilled out to move the cap holderPot rivets holding the cap holder in place need to be drilled out to move the cap holderDrilled out!Drilled out!Capacitor moved to fit in the new transformerCapacitor moved to fit in the new transformerYep she fits...Yep she fits…A;; wired up and working again! Now I remembered the neon in the switch runs on 110V so gave her power from the centre tap of the primary which is half the input voltage. Pleased with that solution!A;; wired up and working again! Now I remembered the neon in the switch runs on 110V so gave her power from the centre tap of the primary which is half the input voltage. Pleased with that solution!Looking good and sounding sweet just need to make a sign for the back to indicate the supply voltage and fuse side then she is good to go!Looking good and sounding sweet just need to make a sign for the back to indicate the supply voltage and fuse side then she is good to go!Back in the caseBack in the case Lovely sounding Sunn Concert Lead in for some work… power supply a bit under engineered for UK supply… so in with a new Toroidal Transformer. Great sounding powerful Solid State amp. Great overdrive sound!

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