Bottlehead Forum
Bottlehead Kits => BeePre => Topic started by: Alby0521 on December 16, 2018, 08:20:02 PM
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Hi
I have 2 different questions:
- is there any suggestion or issue in using 300B-Z shuguang Black treasures on the Beepre? I can’t find the specs of the tubes anywhere and I’d like to make sure they are ok before using them.
- what are the main capacitors where an upgrade makes the biggest difference?
Thanks in advance.
AB
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I can't find the specs of the 300B-Z anywhere either. If it's a 300B, it will work just fine though.
The BeePre uses a pair of 10uF/250V coupling caps that are popular to swap out. If you plan to use the balanced output, you'll want two pairs.
-PB
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Hi Paul
Thanks for the info. I got the pair of new 300B-Z and indeed they work perfectly. Actually what a nice improvement on the stock.
I’m looking for upgrading now the 2 10uf caps. I’m. It using the balanced input so a pair is fine.
Anybody that can recommend brands and models? I was looking into Mundorf supreme silver/oil but then I read that they should not be put in warm situation as they will loose their values.
Any comments or advices?
Thanks again I. Advance.
Best
AB
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I'd look more for speaker crossover caps that carry a 200V or 250V rating. There's a low voltage Auricap available, a Clarity PX, Multicap PPFXS, DynamiCap TRT, or Mundorf MKP Classic.
These caps are more reasonably sized and not overly expensive.
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Thanks for that!
Any experience with the Mundorf supreme (the classic one, no oil)?
Best
AB
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Any experience with the Mundorf supreme (the classic one, no oil)?
Yes, you design a layout and build your amp around a part like that rather than adding it to something already built.
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Thanks for the info. I got the pair of new 300B-Z and indeed they work perfectly. Actually what a nice improvement on the stock.
Could you please offer more detail on how the 300B-Z's improve on the stock tubes? TIA.
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Hi,
I also have the 300B-Z. They make the sound very open and add clarity to the music. I sold the stock tubes and am now using JJ's or the 300B-Z. These however have the tendency to start humming unexpectedly, but then it goes away after some time. When it get's too annoying I replace them by the JJ's. The glass of these tubes are fitted in a rubber compound and never cause any issues. The sound however is less open.
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Could you please offer more detail on how the 300B-Z's improve on the stock tubes? TIA.
Hi Raymond
What I found with the 300b-z compared with the stock hh is that the new tubes are considerably more quiet, add a lot of ‘’matter’’ and density to the midrange and give a tighter and more realistic bass.
I’m very happy with the result.
I now will upgrade the caps and probably add the volume control kit. I’ll make sure I’ll comment here.
Best
AB
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I switched from stock to the PSvane 300b-TII (grey bottle) and it was a significant difference in detail, and sweetness. These tubes were fairly neutral. Now I have the Sophia Electric Royal Princess 300Bs which are the new love of my life. Expensive, but wow.... just wow.
For caps, I went all out to a detailed and sweetly neutral cap in the Mundorf Supreme silver/gold/oil. That was also a significant difference from stock. At first, tried the recommended ClarityCap MR which was also a nice change for not much $$.