K&K Audio / Lundahl Transformers

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1660 18ma connection question

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Posted on June 3, 2020 at 10:43:41
stephen.dolan51
Audiophile

Posts: 2
Location: Ca
Joined: June 3, 2020
 Kevin, I built a Covid 19 SE Amp. I used what was in my project box. 6SH7-1660-300B. The 6SH7 current is 7 ma, what connection should i use for this 18ma interstage?

 

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RE: 1660 18ma connection question, posted on June 6, 2020 at 11:55:24
KevinC
Manufacturer

Posts: 2984
Location: NC
Joined: April 19, 2001
 First things first. Since the transformer you have on hand is gapped for 18mA of bias current, it has less primary inductance than is optimal for a pentode. Are you connecting the tube for triode operation. If so, what is the plate impedance?

Kevin Carter
K&K Audio
www.kandkaudio.com

 

RE: 1660 18ma connection question, posted on June 8, 2020 at 18:07:24
stephen.dolan51
Audiophile

Posts: 2
Location: Ca
Joined: June 3, 2020
 The 6sh7 is triode connected and the Rp is less than 10k

 

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