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Old 7th January 2013, 08:06 AM   #41
palmas is offline palmas  Portugal
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Quote:
Originally Posted by Wavebourn View Post
Indeed! :-)

As soon as I finish a couple of my current projects I am going to build a no-GNFB amp with 12x4P1L :-)
It will be a V12 engine then!
You'll be needing an output transformer with 600Ohm or lower. Looking forward to see some pics.
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Old 8th January 2013, 12:56 AM   #42
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Yes, output transformer is one of main reasons. It is much cheaper to make highest quality output transformer for 600 Ohm than for 10 K Ohm.
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Old 19th January 2013, 10:34 PM   #43
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I was kind of set on the Electro Harmonix, basically because they're cheap and I don't hear anything bad about them. Now I came across these Shuguang 300BS-B. Most people I hear think the current Shuguang's are pretty good and I love the dome shape. Any info on these?

They have the 'mesh' plates, not a real mesh but perforated plates. Is there any reason why this would be a bad (or good) thing?
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Old 19th January 2013, 10:52 PM   #44
cotdt is offline cotdt  United States
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Those mesh Shuguangs sound very nice. I have them.

Western Electric themselves used perforated plates on some of their tubes. It is not clear why they sound different.

But compared to true mesh, the perforated plates only lose 10% of their surface area.
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Old 21st January 2013, 05:25 PM   #45
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Thanks for the info, where did you get them?
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Old 5th February 2014, 06:55 AM   #46
mthoi is offline mthoi  Malaysia
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Is there anyone using 300b PP amps in an active biamping?

I have a pair of DIY c3m/300b monoblocks driving my Altec 515-8b/VOTT using an active crossover from 50Hz - 500Hz. Currently, I have a pair of Shuguang Treasures 300b in one channel and the other channel using JJ 300b. I am currently using Sylvania VT244 (5u4g) rectifier tubes.

Does the choice of 300b tube make a significant difference since it is only driving a narrow range of the frequency?
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Old 5th February 2014, 01:35 PM   #47
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i changed what was a 6av5 se into a 300b amp just because i saw a pair of guangan?!? 300bs for 58 pounds delivered!!!!
they turned up quickly
look fine
and sound good enough to build a better quality amplifier around them.
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Old 5th February 2014, 09:59 PM   #48
tomchr is offline tomchr  United States
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I use 300B in SET for active biamping. The choice of tube does matter. I currently run with JJ tubes but have tried some Full Music on the tweeters. They sound heavenly, but one of them had issues with thermal run-away so I returned those to the vendor.

~Tom
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