The DC resistance in the GM70 grid should be kept under 30k to ensure stability and prevent the GM70s from runaway. The GM70 has the advantage of no top cap keeping the high voltages …

2016年8月2日 · hello, my last amp sound really very nice, its a GM70pp driven by VT25/10Y by Sowter 8424S. input sennheiser transformer for 6E6P-E and 1rst IT Hammond 126B. similar …

2007年8月17日 · Hello, I am designing a GM70 PP that will be driven directly through a 500 Ohm /10 K + 10K surplus interstage transformer by UTC, able to pass up to 4 Watts of power, …

2005年4月19日 · Considering the filament power required by the GM70 (80 watts EACH!) using SMPS instead of regular power trannys saves a lot of space and money. I calculate a stereo …

2019年7月14日 · Folk round here tell me the 813 isn't that great incomparison to the GM70. I want to have enough valves to feed this thing in the coming years and GM70 are reasonably priced …

2015年10月9日 · Je suis passé chez Claudio samedi dernier ou j'ai pu écouter avec ravissement son ampli GM 70 PP associé à son pré-ampli. Ça fonctionne vraiment bien sur tous les …

推动级用了2A3B加1:1推动牛去激励GM70作单端功率放大，2A3是只线性十分优秀的低内阻三极管，在这作A类推动放大时的推动电最大可以达到200Vrms，足以推动845或FD71(三极接法)等 …

2024年10月29日 · Hindsight is a wonderful thing and I should have gone for linear supplies to heat the GM70 rather than SMPS. I couldn't get the SMPS noise out and going linear has …

The main advantages of the GM70 is the higher amplification factor (8 instead of 5). Using the 845 it is necessary use a strong driver stage with a very high voltage amplification, low output …

2019年7月14日 · There must exist examples of pp gm70 circuits. Otherwise you’ll have to create push pull compound characteristic curves put in you’re loafline which links the two and choose …