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50W monoblock "Engineers Amp"
50W monoblock "Engineers Amp"
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Old 10th July 2019, 05:28 PM   #211
vinylkid58 is offline vinylkid58  Canada
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Old 11th July 2019, 02:02 PM   #212
kstylianos is offline kstylianos  United States
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Originally Posted by vinylkid58 View Post

So I can assume input sensitivity is ~1.9v, or was this a silly "yes"?
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Old 11th July 2019, 03:46 PM   #213
smoking-amp is offline smoking-amp  United States
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If the N Fdbk resistors (local shunt Schade) are the same, then the output stage would have similar gain (except for 6HJ5 gm versus 6JN6 gm, and the different OT impedance ratio).

If global N Fdbk is installed (to the input stage) then the overall gain would be reduced.

And the input tube gm (6CB6 changed to 6GU5) would change the gain (without the global N Fdbk loop installed), but seems to just make up for the reduced sensitivity of the 6HJ5 (for increased power) versus the previous 6JN6. Some other high gm input (pin compatible) tubes: 6EW6 and 5/6JK6. 6EW6 has similar gm to the 6GU5, but probably more linear. 5/6JK6 has higher gm (will be louder). Some 5/6JK6 tubes have a hysteresis problem at high signal level, can be fixed with +30V on grid 3.

Yes, maybe, depends.

Last edited by smoking-amp; 11th July 2019 at 04:04 PM.
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Old 11th July 2019, 09:21 PM   #214
TonyTecson is offline TonyTecson  Philippines
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50W monoblock "Engineers Amp"
i made a pp amp out of the 12en6 and i can tell you, this amp gives the 6v6 amp a good run for the money, do not let the 7 watt plate ratings fool you....
planet10 needs your help: Let's help Ruth and Dave...http://www.diyaudio.com/forums/plane...ml#post5010547[B
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