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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

Double insulation meets safety specs of most countries , except UK , AUS ... Ground means hum ( not always ) and double insulation means safety . Ciao Marco

Other curiosities , related to TT , or better tone arms : -Thorens Tp16 and Rega Planar 1 arm have no ground connection. -Project Debut Carbon arm ( the same as Rega arm ) has ground connection . Ciao Marco

This is the best article I found . The first part requires a theoretical skill , but the second part is very practical . My experience Is : no ground . There is an exception : U,K, Ciao Marco

Happy Easter to all ! Marco

That is the situation in Europe . Direct replacements are available for most bulbs but in case of special bulbs ( low power or hi power ) In these cases you can use halo lamps. Light dimmers are not compatible ; they must be replaced with new types . When you choose new bulbs forget...

For me the principal is crazy or mad ( or both ) The real problem is the " politically correct " that now it''s becoming " calcel culture ". It' s a worldwide phenomenon . It's a soft form of tiranny ! Michelangelo will exist forever ! Ciao Marco

Welcome to Phase Linear wonderful world | Marco

Ciao from Italy ! Marco

Today I have made the modification . At present I have not seen the arcing effect. Ciao Marco