TubelabSE Are my heatsinks big enough for 300B's?

[boywonder]

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

Everything except the tube sockets is bottom mounted.....

[boywonder]

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.

[rknize]

The one on the regulator/rectifier needs to be quite a bit larger.

[lth1]

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

[Evenharmonics]

Originally Posted by rknize

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.

[Evenharmonics]

Originally Posted by boywonder

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?

[boywonder]

Originally Posted by Evenharmonics

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.

Originally Posted by Evenharmonics

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.