CHAMP ELECTRONICS -" THE VINTAGE VALVE AMP HOSPITAL"

NOTTINGHAM, ENGLAND

 

SERVICING OF A GIBSON BR-9 COMBO AMPLIFIER

 

 

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Another one that looks really cool!!

 

 


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Looks really cute! Unlike the push-pull pair of 6V6’s in the BR6….this BR9 still uses a pair of 6V6’s but……as a single-ended paralleled pair……..works great and sounds cool!



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The field-coil type of speaker magnet again, along with another speaker-mounted output transformer. One point worth mentioning here is that there is a second small coil which is wound on with the field-coil. This coil is then put in series with the main speaker coil itself but, out-of-phase. This has a kind of cancelling-out effect to reduce hum somewhat. Clever stuff!



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The main triple HT cap had already been changed on this baby but…….was a bit bodged.



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After a rewire of the HT cap, a good few components and again…..a reworking of the ground line she was all finished and working really well, lovely old amp!

 


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 Finished!



 

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