Ah so - some while back when I put out feelers for possible use of 6AS7s and 6080s as powers I assumed there were other factors going against their use in our LDs...eg. plate dissipation 13W (6080). Was I worrying unduly, and do we just need to provide an external heater supply of 2x 2.5A (6080) to be safe? If so , these 6080s sure do look interesting...
Now this is another real problem to use 6AS7's as powertube with LD. With 150ohm cathode resistors 6AS7 could hog 4-5 times the current what 6N6P uses! I think LD does not have enough anode current. And LD resistors can't stand the heat. Cathode resistors should be 10W.
Hi Artsi and Gibosi,
A 6BX7 tube is on the way which uses a 1.5A heater - should not be a problem for my 5A voltage regulator and power supply.
Re the 6AS7, 6080 and similar tubes with a low amp factor of 2, what would be the result using such a tube as a driver in the LD MKIII together with my 110W ss Sony amp driving speakers?
As it is now, the LD volume control is always set at near clipping (around 3o'clock), and the Sony volume is on low. (As a comparison, when using headphones I cannot use a higher setting on the LD than 9 o'clock without risking my hearing.) The Sony amp has a LED bar graph that indicates less than 1-2W (!) to get more than adequate listening levels. If I play really loud and go higher than say 30W on this meter I experience audible hum (that may be masked by the music).
Using the 6AS7 etc tubes, would I need to increase the volume level substantially? The tube I am using now, the 8FQ7, has an amplification factor of 20.
When coming to gain 6BX7 and 6AS7, 6BX7 should work ok and 6AS7 could be 5x quieter. 5998 is better option with amp factor of 5.5.
Edited by Artsi - 3/23/14 at 8:37pm