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Messages - tonykyma

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General Discussion / Re: Tube Manufacturing
« on: December 27, 2011, 09:04:02 AM »
Hi Myles
Are you trying to say tape should sound with tubs ? I am already on this way
tony ma

Hi Robert
You said your system with tubes, I did modified my A810 with a tube out put in very good result. I post that with pictures in, also we did some pure analog recordings, for reference visit
tony ma

Tape Tech / Re: STUDER A810 tape transport: problem solved!
« on: June 19, 2011, 07:25:21 AM »
I believe that you are a DIYER and analog lover, I just fixed a B62 which was damaged in shipping of not working in control section, lucky it is designed in all mechanical relays that in my limited knowledge still can be fixed , A810 sound not bad but it like a digital machine more than analog , too many IC in used ,I did modification for my A810 with change the out put section into TUBE out put this came out in very positive return ( next step is the repro head in put section too, analog music with today's TUBE amp is the best combination I do believe !
tony ma

I did for A810 in changing into tube (7119 mu stage) of the out-put stage, with a selector switch for compare to the original circuit in a very good result. also not too long ago I did for A80's record amp in changing the in-put and drive stage into tubes and transformer coupling, but kept the EQ section in because I want to use the same CCIR,NAB filter and adjustment pots.this one end up with big return than the stock in working with ribbon tube mic and tube mic pre amp of live recording.
Now I try to work with it's repro amp too, in stock design the first stage has gain and EQ, sec stage also has gain with all adjustment pots and cross talk too, If I still to keep those that mean I can only change the out-put section again. This days more people use separated tube or SS repro pre amp direct from head but with a simple EQ and frequency control design not like the A80 so complicate (maybe that is specially design for it's head and transport or that is the main factor of it's sound character presentation)
Although my favor is all tube and passive filter without feedback, but that is only experienced in RIAA phono stage none in tape playback, So What do you think ? a simple passive EQ and all tube is better or a Hybrid with it's own EQ filter and controls ? maybe in future I will have both to compare but now I have to pick one first
tony ma

Reel to Reel Tape Machines / Re: Revox C270, playback mods
« on: March 25, 2011, 02:31:02 PM »
Hi John
I changed all coupling caps in repro amp to very big in size Solen because of same capacity , switch and resistors for CCIR. pictures for reference

Tony Ma

Reel to Reel Tape Machines / Re: Location of External Pre
« on: March 25, 2011, 01:47:52 PM »
just side of the recorded on a table, that is a external circuit with tubes and transformers of record amplifier for Studer A80

Tony Ma

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