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Old 19th November 2010, 04:28 PM   #1
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Default TubelabSE Are my heatsinks big enough for 300B's?

Are my heat sinks big enough for 300B's?

Everything except the tube sockets is bottom mounted.....
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Last edited by boywonder; 19th November 2010 at 04:37 PM.
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Old 19th November 2010, 07:39 PM   #2
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One other question.....after debugging I'm planning on running a mullard CV378/GZ37 rectifier. Any issues? is a 47uf first cap OK with this rectifier? I cannot locate a datasheet.

PSUDII shows about 20V additional voltage drop compared to a 5AR4.
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Old 19th November 2010, 08:27 PM   #3
rknize is offline rknize  United States
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The one on the regulator/rectifier needs to be quite a bit larger.
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Old 20th November 2010, 06:13 AM   #4
lth1 is offline lth1  United States
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My Tubelab SE Edcor 250V CT PT has a no load voltage of 268V.

With 5AR4 as rectifier, first cap is ASC 2.58uf, then CX14 choke(6H 154ohms), and second cap is 98.5uf ASC, B+ is 278VDC @ 28mA.

With GZ37 as rectifier, first cap is 3.3uf, CX14 choke, and 98.5 ASA cap, B+ is 277VDC @ 27mA.

Hope that this will help with installing the GZ37. I do like the sound of the GZ37 better than the GZ34, at least with my test setup

Lee Hankins
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Old 20th November 2010, 01:55 PM   #5
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Quote:
Originally Posted by rknize View Post
The one on the regulator/rectifier needs to be quite a bit larger.
Maybe just little bit. Mine (300B TSE) is not much bigger than what's pictured and it works.
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Old 20th November 2010, 01:58 PM   #6
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Quote:
Originally Posted by boywonder View Post
Everything except the tube sockets is bottom mounted.....
Are the heatsinks for Q1 & 2 and U2 & 3 mounted to the board or are they hung off of semiconductor leads?
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Old 20th November 2010, 03:46 PM   #7
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Quote:
Originally Posted by Evenharmonics View Post
Maybe just little bit. Mine (300B TSE) is not much bigger than what's pictured and it works.
Well, I suppose I'll try them out.....the regulator has thermal protection, correct?

I have other PC CPU heatsink organ donors, so if I can shoehorn in something bigger I'll do it.



Quote:
Originally Posted by Evenharmonics View Post
Are the heatsinks for Q1 & 2 and U2 & 3 mounted to the board or are they hung off of semiconductor leads?
They are hung off of the semiconductor leads.
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