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BH upgrade iron

108.175.229.244
Posted on March 23, 2017 at 07:31:30
vetmedrobert@gmail.com
Audiophile

Posts: 453
Location: Ontario
Joined: September 20, 2007
 Years ago I purchased all nickel upgrade iron for Bottlehead's S.E.X. 2.0 version. Can anyone tell me the primary and secondary impedance and the current rating of the accompanying choke? I'm thinking I could use it for a 45 amp but am open to suggestions if anyone has a better idea. TIA

 

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RE: BH upgrade iron, posted on March 23, 2017 at 08:27:28
Paul Joppa
Industry Professional

Posts: 7295
Location: Seattle, WA
Joined: April 23, 2001
 In general, Mike won't give details on custom parts he makes for Bottlehead. But I can do that. The BH-2 plate choke rating is approximately 50 henries at 40mADC - thus quite suitable for a 45.

Just a note, the BH-1 output transformer is rated 8000 ohms primary impedance, which is much higher than normally used with a 45. Better to get one of Mike's 5K parafeed transformers.

 

Thank you PJ (nt), posted on March 23, 2017 at 08:31:04
mqracing
Manufacturer

Posts: 4323
Joined: June 29, 2000
 ...



Builder of MagneQuest & Peerless transformers since 1989

 

RE: BH upgrade iron, posted on March 23, 2017 at 08:51:40
vetmedrobert@gmail.com
Audiophile

Posts: 453
Location: Ontario
Joined: September 20, 2007
 Thanks for your response. I'm not necessarily wedded to the idea of using the 45, only of a directly heated tube that I could use with 8K primary. Otherwise I have a transformer that can't be used for its original application as I no longer own the amp for which it was intended, nor is that amp kit being made any more.

 

801A?, posted on March 25, 2017 at 11:30:45
Paul Joppa
Industry Professional

Posts: 7295
Location: Seattle, WA
Joined: April 23, 2001
 Just a thought...

 

RE: 801A?, posted on March 26, 2017 at 10:08:06
vetmedrobert@gmail.com
Audiophile

Posts: 453
Location: Ontario
Joined: September 20, 2007
 A great suggestion, thanks. Only problem to me is the high B+ needed.

 

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