MasterSound - Evolution 845 Integrated Amplifier ... Anyone hear one or have one ? ...

Dean hi,

For schematics you can also try to get in touch with Steven at the " service department ct " (that is how to google it, no spaces) in Connecticut, USA , as he has handled warranty claims for the Mastersound in the Northeast USA, and I know that an ex dealer Soundapproach in Virginia, USA used to have a tech who had all the schematics for the integrated amps... As far as I know their design is fairly simple, any competent tube tech should be able to figure your problems.... Strange you have had problems getting answers from the Mastersound, they replied to my inquiry in a day or so, may be their delay is Covid related, as is pretty much everything these days.
 
Hi Ellie,

Thanks for your reply and the information above, if needed I will head there next.

Yes, Mastersound eventually did come back to us with the relevant information we requested. The work was carried out but unfortunately when I got home and tested there is still an issue with noise on the left channel. It looks like there has been more than one problem with the amp. It is due to go back in January.

Paul came back to me very quickly but was unable to help with the schematics.

Thanks again.

Kind `regards
Dean
 
Dean,

Hope you resolve your issues. The key to the Mastersound's reliability is bias checks (despite the factory claims of it being automatic, etc) and adjustment every 2 to 3 months, and using tubes from reliable sources.
 
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