Latest Thread Images

2359glenn | studio
Apr 26, 2013 at 3:50 PM Post #2,656 of 39,986
There is no hope then for me is there?
 
Can I talk about Box Plates VT-52's?
 
Apr 26, 2013 at 7:35 PM Post #2,657 of 39,986
The 300B tubes are cool looking. Has anyone heard the VA 300B?
http://www.enjoythemusic.com/channel/ch300b/
 

 
Apr 26, 2013 at 8:14 PM Post #2,658 of 39,986
The main reason that I was interested with the 300B tubes was that the Woo WA5 was fantastic sounding amp. I know nothing about VT-52 tubes. My "'idea" tube amp would have digital control with display over the high voltage and bias. I noticed that voltage operating point and bias can make quite a bit of difference in SQ within reason with the 6AS7/6080 amps. I am getting the impression that various 300B tubes will sound the best with slightly different voltage and bias depending on who makes them. Of course any audio coupling caps can make a difference. What about bee wax caps? You have to wait for the cap to warm up and the wax turns into a liquid for best sound? 
 
Apr 26, 2013 at 8:22 PM Post #2,659 of 39,986
Quote:
rosgr63 said:
 
Design, Research & Development and Production must be separate from QC.
 
I want the QC/testing part.
 
Please!!!!!!
tongue_smile.gif

 
 
Click to expand...

   You never can tell you might get your wish.
 
Then you will find out hard it is to listen to music evaluating a new amp and eating home made cookies.  
 
Apr 26, 2013 at 8:37 PM Post #2,662 of 39,986
Quote:
john57 said:
The main reason that I was interested with the 300B tubes was that the Woo WA5 was fantastic sounding amp. I know nothing about VT-52 tubes. My "'idea" tube amp would have digital control with display over the high voltage and bias. I noticed that voltage operating point and bias can make quite a bit of difference in SQ within reason with the 6AS7/6080 amps. I am getting the impression that various 300B tubes will sound the best with slightly different voltage and bias depending on who makes them. Of course any audio coupling caps can make a difference. What about bee wax caps? You have to wait for the cap to warm up and the wax turns into a liquid for best sound? 
Click to expand...

The amps I built Clayton he can adjust the bias but not the B+ other then by changing the rectifier.
I really don't like putting another tube or transistor in line with the power.
What device would be used for the regulator another 300B?
I have found that 300Bs sound best when run at 425 to 450 volts Clayton's amps will run them at
425 if he uses a GZ37 rectifier. they sound best when run hot and this is no problem for JJ 300Bs
 
Apr 26, 2013 at 9:12 PM Post #2,664 of 39,986
Quote:
2359glenn said:
The amps I built Clayton he can adjust the bias but not the B+ other then by changing the rectifier.
I really don't like putting another tube or transistor in line with the power.
What device would be used for the regulator another 300B?
I have found that 300Bs sound best when run at 425 to 450 volts Clayton's amps will run them at
425 if he uses a GZ37 rectifier. they sound best when run hot and this is no problem for JJ 300Bs
Click to expand...

Yes that would be more practical by changing the rectifier to adjust the B+ There was a tube amp in the KickStart program that would have the digital control but did not received the required funding to start. If I had the choice for the first 300B tube I would stick with the JJ just simply my experience with Chinese tubes of other types have not been good in different amps. Generally I find that Russian tubes hold up a bit better than the Chinese tubes.
 
Apr 26, 2013 at 9:17 PM Post #2,666 of 39,986
Quote:
john57 said:
Yes that would be more practical by changing the rectifier to adjust the B+ There was a tube amp in the KickStart program that would have the digital control but did not received the required funding to start. If I had the choice for the first 300B tube I would stick with the JJ just simply my experience with Chinese tubes of other types have not been good in different amps. Generally I find that Russian tubes hold up a bit better than the Chinese tubes.
Click to expand...

Could use a 300b or a 6AS7 for the series pass tube. The 6AS7 would only be able to adjust the B+ by 125 volts
 
You must log in or register to reply here.

Users who are viewing this thread

Total: 35 (members: 1, guests: 34)
Back
Top