|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
209.202.78.124
In Reply to: RE: Some puzzling calculations posted by Paul Joppa on January 27, 2015 at 17:21:21
Paul, you are absolutly correct, WE tubes are very much used in a last 15 years.
Also, I did some distortions measurements, in the same position with the same driver. ER300B measures best up to 2V/16ohm. At 1khz and 10khz ELrog is slightly better (1-2db) then EMlabs and 3-7dB better the WE (again, used)
Clipping is at 9v/16ohm (~5w)
Test bench: LAG-126 (analogue low THD) generator, HP333a distortion analyzer with o'scope connected after the bridge to see the spectrum.
One more, with ER300 sensitivity is down exactly 2/3. So driver tube is working harder (more distortions) with ER300, yet total level of distortions is down. Indeed remarkable tube !
Follow Ups:
that is matching the input and output stage well I see the same when I replace 6sn7 with 6GU7 in my KT120 triode connected amp. Lower total distwhen udeing 6gu7 with innherent higher dist
So the Elrog by your measurements has lower power and higher distortion than the EML I see. I wonder how that plays out sonically. I happily use the EML XLS in my SET. I'm very curious to hear the Elrog in my amplifier. Hopefully I will in the next few weeks. I'm energized by all the very positive reports so far. The EML has been excellent for me and will serve as my reference point.
Hi,
If you can accommodate about 3dB less amplification, about 5 watt power and if you 300B filaments PS are filtered DC, you will have a very pleasant surprise.
Thanks for the reply Alexz. My 300b SET is DC heated fortunately. I'm patiently waiting for a delayed shipment from Germany to the USA distributor. 5 watts should be no problem as I seldom get out of the 1st watt of power anyway.
..each tube make may have different optimal operating points,If you have bias adjustment you may adjust it a little..., The current drawn bye TJ mesh, EML , WE and Erog are quite different at the same Vg and Vpk. But in as selfbiased circuit the operating pint ar more similar. My simulations gives the following results for the typical 6sn7/6sn7/300b amp like Waltons schematic equal to "J.E. Labs 300B"
, YMMMV.
Edits: 03/26/15 03/26/15 03/26/15 03/26/15 03/26/15 03/26/15 03/26/15 03/26/15 03/27/15 03/27/15
Enjoy !
Edits: 03/25/15
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: