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Actually I use a pair of TJ 300B solid plates and this tube have a string bass.
I ser some GUIGUANG 300B with a cheap price and I have interest.
Anyone use this GUIGUANG tubes?
Have a good bass or sound as regular Shuguang ?
Aldovan
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The bias is not ok, because I do not have a 400V transformer and in the prototype run with 275V, 215V in plates.
When the transformer for chassis arrival, then I can adjust the perfect bias, thanks !
I would be taking a hard look at the amplifier you have in terms of the bass quality you're getting. A small output transformer with insufficient inductance will cause this problem on its own.
As for the Guiguang tubes, one that I had made strange noises right out of the box. After about 20 hours of use, heat from the tube cracked the black base. After about 100 hours of use, that tube failed.
The other tube in the pair seems to be holding up OK, and the newer ones look to use ceramic bases.
The noise is from spider circuit prototype with many lost wires.
With the Shuguang or other 300B the noise is the same, sorry.
I'm not sure I understand what you're saying.
The circuit has noise because it is messy, has no shield.
The noise occur with any 300B tube.
Which circuit?If you're speaking of the ones I'm using, which are quiet with the other Guiguang tube and the other 4 pairs of 300B's that I have, then I'm really lost by your replies.
If you're saying that you have a noisy 300B circuit, I'm also perplexed.
Edits: 11/30/14
Bass is mainly a function of bias. Most likely your TJs are running lea. If they are as lean compared to the other chinese tubes, they are not being run correctly. "Auto-bias" is really simply non-adjustable bias.
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