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In the mean time I found this report : https://www.audiosciencereview.com/forum/index.php?threads/review-of-the-mcm-custom-audio-model-50-8394-ir-remote-volume-control.43575/ It looks a good stuff . Ciao Marco

In Amazon.com is out of stock , but in Europe ( named Omnitronic LH 125 ) it's avalable . I had to quote the MCM , because this is an American forum . Any way glad to hear that this kind of devices works. Ciao Marco

Does anybody know this device ? Chinese junk or good stufF ? https://www.amazon.in/MCM-CUSTOM-50-8394-CONTROL-IR/dp/B01CX82KH2 I would to connect it between the tape out of my 2215 bl Marantz receiver and my ST 70 VTA tube amp. Ciao Marco

These are service manuals . I have a 4150 and I had bad contacts . Clean and go . Hope this helps you . Ciao Marco

Louis Armstrong ! His trumpet and his voice are fantastic with my new toy (Bob Latino's Dynaco VTA ST 70 ) Ciao Marco

Welcome to Phase Linear wonderful world ! ( and more ) Ciao from Italy Marco

Yesterday the dilemma was vinyl or CD Today is tube or solid state . Buy both and be happy . Ciao Marco

My Dynaco VTA ST 70 is running . The sound is great : high dynamic range , but " warm" . It's a very good tube amp ! Ciao Marco

Ciao Marco

Ciao from Italy ! Marco

It' s obvious that if you measure a new device there's no debate . I consider the room , the speakers and the power amp as the most relevant things in a hifi system . -the room is a " black box " with a lot of resonance peaks -the speakers are a trasducer ( very , very difficult to design )...

Joe , from technical point of view everything is correct , but can you appeciate the different in sound ? It's a provocative question to stimulate the discussion ( friendly of course ) Ciao Marco

Bob , I have a Dynaco system that powers a pair of AR 6 ( Pat 4 , Fm5 an St 120 ). For me the sound is good , considering all the system , room included . Objectively , studying the diagrams : Pat 4 has an unregolated power supply ( unusual ) St 120 has , on the contrary , a regulated power...

Oops .... a mismatch between recovery and limiter . Ciao Marco

Joe , my memory .... Sorry ! Ciao Marco

https://patents.google.com/patent/US3727148A/en Ciao Marco

The secret of Dynaco is the output transformer e not the power tranformer . Output tranformers must be linear and must have no saturation . At present only McIntosh and a Swedish company ( Lundhal ) are able to build very good output transformer and probably a Japanese company (EL ) Other...

Oops I forgot me . Ciao Marco

Look at these pictures . For it' s a good starting point . ( From Yamaha CA 2010 service manual ) Ciao Marco

Vintage american preamps ( PL 4000 , Marantz and so on ) now don't meet the specs , because they were designed in the 70 s . On the contrary Japanese devices generally were already O.K. Ciao Marco