Now working in China nd moved into a small condo, therefore hobby is at a standstill
bro, my first exposure to GM70 sound is at CM's place in 2004. He was using 6J5 to 2A3 IT to GM70. Love the sound. was contemplating a two stage topo.....eg.D3A to GM70. Many mentioned that the D3A has enough gain mu =70 to drive the GM70, which is in fact not difficult to drive. I have wired up experimentally to try out b4 finalising the chassis placements. I referred to Thomas Mayer's expertise. He had mentioned that using the two stage circuit....has enough gain...but the issue is not just gain. These big transmitter tubes require the headroom of the two stage gain in order to sound good. And he has been advocating the VT25 as drivers. Given his track records and experience i take that should be the correct approach. Not that the D3A single stage sound bad, but the DHT drivers have more punch and really makes the amp sound so much bigger. The D3A single stage sounded very sweet and delicate. But when i had this amp in mind, i have intended it for BOOM BOOM BOOM, WHACK WHACK WHACK.... As far as i can remember, CM had posted that the VT25 sound very good in his amp during those days when echoloft forums were still alive. That is how i decided to experiment with the various DHT drivers and the finalised topo.
@GAGA@echoloft Yo bro, I have a jig for measuring your amp performance...
beautiful!!DIY seems pretty "far" away for me now.. just had an expensive wedding and a european honeymoon..
tube amps are unlikely to give impressive test results! But can share what u have ?
Summit Series, ie. their 'higher' line, with teflon interwinding dielectric, dual C-cores.To add : checked price of Tango X10 with Larry, they cost a whopping $2.5k now!