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Old 8th August 2012, 10:14 PM   #31
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I've just learned about the Valve-art 350B's like few days ago. It's time I got new tubes for my amp. Looking at the Western Electric datasheet..it seems like we need some minor adjustments. Bias is only 50 mA and filament current draw is 1.6 Amp vs. just 0.9 for 6L6GC. I have 720 ohms resistor to keep bias happy but how to tweak the filament current draw? I'm using the Edcor XPWR0035. HV secondary has 2 amps available.

http://www.tubezone.net/pdf/we350b.pdf

Last edited by imnewbie; 8th August 2012 at 10:17 PM.
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Old 8th August 2012, 11:57 PM   #32
w5jag is offline w5jag  United States
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You can't change the filament current draw of a tube.

You could add another filament transformer, I suppose - either as a stand alone or in parallel with your existing transformer to boost the current rating.

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Old 9th August 2012, 12:48 AM   #33
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Edcor XPWR035-120 has a 5A 6.3v CT winding. 5V winding is rated at 2 amps.

jeff
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Old 9th August 2012, 01:08 AM   #34
kkcinc is offline kkcinc  United States
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Quote:
Originally Posted by imnewbie View Post
I've just learned about the Valve-art 350B's like few days ago. It's time I got new tubes for my amp. Looking at the Western Electric datasheet..it seems like we need some minor adjustments. Bias is only 50 mA and filament current draw is 1.6 Amp vs. just 0.9 for 6L6GC. I have 720 ohms resistor to keep bias happy but how to tweak the filament current draw? I'm using the Edcor XPWR0035. HV secondary has 2 amps available.

http://www.tubezone.net/pdf/we350b.pdf
I can run the valve art 350b tubes all day long with 440v B+ and the 560 ohm resistors. In ul with feedback. They sound good and the plates don't glow. I don't think they are like the originals.
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Old 10th August 2012, 12:51 AM   #35
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How do your 350b tubes sound compared to your original 6L6WGT+?? I've got an se 6L6 amp that I really liked with the WGT+ Russian tubes and they can take 500V max and I thought they sound the best of all the vintage 6L6 I tried.

Cheers,
Bob
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Old 10th August 2012, 03:53 AM   #36
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Quote:
Originally Posted by kkcinc View Post
I can run the valve art 350b tubes all day long with 440v B+ and the 560 ohm resistors. In ul with feedback. They sound good and the plates don't glow. I don't think they are like the originals.
Valve art supposedly sources from Shuguang. Shuguang 6L6G is only rated at 400V and 25 W plate dissipation. I guess Valve art 350B's have MUCH higher plate dissipation than that.
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Old 10th August 2012, 05:47 AM   #37
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Been busy digging for 350B datasheet. And found 350C datasheet. "C" stands for carbon so basically the same tube but with carbon plate. Plate voltage is 400V. So I guess using it with B+ of over 400V is not a good idea?

http://www.tubeampdoctor.com/images/File/350C.pdf

Also, since this tube draws 1.6 amps...is it going to be problem if The rectifier tap only has 2 amps? Kkcinc, Which transformer you are using?

Last edited by imnewbie; 10th August 2012 at 05:55 AM.
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Old 10th August 2012, 02:11 PM   #38
kkcinc is offline kkcinc  United States
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I really have no idea what the valve art 350b is. All i know is that it sounds quite good and did not blow up with 440v B+. Light and airy. Not a ton of bass, but very pleasent. I like it better than the 6l6wxt+, which is a very well regarded new production tube.
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Old 10th August 2012, 06:25 PM   #39
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Quote:
Also, since this tube draws 1.6 amps...is it going to be problem if The rectifier tap only has 2 amps?
No, the output tubes run from the 6.3 volt winding which has nothing to do with the rectifier. As long as the total draw for all the tubes EXCEPT the rectifier (which has its own winding) add up to less that the rating of the 6.3 volt winding, you are OK in this regard.

The plate voltage is the voltage measured from the cathode of the tube to the plate of the tube. The B+ is the total voltage supplied by the amps power supply. Some of the B+ is lost in the OPT, and some is dropped in the cathode resistor. The usual loss in these two is 30 to 40 volts so you will be very close to the 400 volt rating. Most tubes have plenty of margin in this regard, but I have no experience with the 350B.
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Old 11th August 2012, 03:53 PM   #40
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This means it's possible use NOS 807's rated for maximum of 400V plate voltage. Time to make some 5 pin to 8 pin sockets.

WTB: Silicone test lead wire for anode caps of 807's? I see Mouser has Pomona 100ft for 22$. But I want to know about other options.
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