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donsachs

Responses from donsachs

300b lovers
Actually, I have already improved the preamp considerably with a few subtle changes, and the power amps will get improvements to the power supply with the larger case, as well as higher quality and physically larger film caps in what we now know a... 
300b lovers
@alexberger Consider using the tube rectifier for the front half of the amp and good diodes for the 300b.   Do a C-L-C for each and use a good film cap as the last one after the choke.   Separate power supplies allow the input and driver tubes to ... 
300b lovers
Yes we all have different tastes.  I would say the Lynn and I overlap considerably.  When we discussed our favourite rooms at the PAF we were in general agreement.  I stand by what I said a million pages back in this thread.  If I were to magicall... 
300b lovers
@atmasphere  Yes we agree.  If you cannot drive a loudspeaker in a normal room to adequate levels with 60 watts/ch, then you really need to reconsider your speaker choice! The least efficient speaker I ever owned was a pair of Joseph Audio RM25s... 
300b lovers
@atmasphere Please don't think I was implying that "tube watts" are somehow louder than "SS watts".  Just that I have heard both driving speakers and straining and I know which I would prefer to listen to when driven hard.   When I was building th... 
300b lovers
The above, in a nutshell, is why tube amps behave very differently at clipping than SS amps. It is why, with the right speaker of course, that a 60 watt tube amp can sound like it has the drive of a 200 watt SS amp, and especially why these 300b m... 
300b lovers
This is where my good friend Lynn and I disagree:)   I have heard my Lampi Pacific in the same system as the May (which Lynn doesn't favor).  I have heard various tube based DACs, the Schiit Yggy and a few others for SS, and the Pacific is in a di... 
300b lovers
@alexberger  I don't use tube rectifiers in power amps, but I do use them in preamps.  In your amp, if you wish to keep the 5u4g, I would consider using it for the input and driver section and using good quality diodes to drive a separate power s... 
300b lovers
@lewinskih01 I have experimented for years with tube preamps.   When I built the Raven preamp it was after I had sent the 300b monos down to Spatial Audio for the Seattle show.  Then I built the matching preamp.  They were able to run the mono amp... 
300b lovers
@antigrunge2 Yes, IT is known as an excellent way of coupling, but it is expensive for very good ITs, and also they take far more physical space than your typical coupling cap.  So most vintage tube amps use RC coupling due to cost and size consid... 
300b lovers
@alexberger Fantastic!  I love success stories!   I came around to really good ITs on this project.  LC coupling was next best, but once I got the custom wound Cinemag IT, designed specifically for the circuit it was no contest.  Enjoy your amp.  ... 
300b lovers
I might add that these preamps and amps will be produced by Spatial Audio Lab in Salt Lake City, UT.  The builders are young and will be around for a long time.  Should they ever need repair it will be easy shipping.  They should be quite reliable... 
300b lovers
@pindac  There are only a few things one can do to keep someone from pirating a design.   Point to point wiring and manufacture avoids circuit boards.  When someone sends a PCB design for manufacturing, there have been cases when designs have bee... 
300b lovers
@pindac  Our egos are not too bruised.  We have a pretty thick skin.  No matter what you do, there will be a certain number of people who are unhappy.  It cannot be helped.  This thread has been a wonderful discussion of amp topologies, with all ... 
300b lovers
Hi Ken.. Admittedly biased, but both Lynn and I thought your room and our room were the most musical ones at the show, and we were neighbors too.  Obviously others will have other opinions, but many folks told me that our two rooms were in their ...