K&K Audio / Lundahl Transformers

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preamp w/1674 output transformer

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Posted on March 1, 2016 at 14:39:02
M. Vidal
Audiophile

Posts: 235
Joined: September 13, 2000
 hello: my tubeo preamp uses the 1674 output transformer preceded by a 1 uf capacitor. i was wondering, for the purpose of using a much better coupling cap i have on hand with a smaller value, if i can connect a resistor to ground inmediately prior to the transformer with a calculated value so not to affect bass performance. thanks.

 

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RE: preamp w/1674 output transformer, posted on March 1, 2016 at 16:12:23
KevinC
Manufacturer

Posts: 2984
Location: NC
Joined: April 19, 2001
 What output tube are you using?

Kevin Carter
K&K Audio
www.kandkaudio.com

 

RE: preamp w/1674 output transformer, posted on March 1, 2016 at 17:37:56
M. Vidal
Audiophile

Posts: 235
Joined: September 13, 2000
 its a Supratek Chardonnay, 6sn7 thanks

 

RE: preamp w/1674 output transformer, posted on March 1, 2016 at 19:08:36
KevinC
Manufacturer

Posts: 2984
Location: NC
Joined: April 19, 2001
 Given that the designer has much more experience with 6SN7GTs driving LL1674, I thing that your question is best directed to him. My only similar experience is with paralleled 6SN7GT triodes (1 bottle per ch) driving an LL1676 in parafeed. The LL1676 has the same primary inductance as the LL1674, so it's comparable. I found that 3uF sounded the best and avoided premature bass roll-off as well as subsonic resonances. I didn't try to find a way to use a smaller capacitor, so my experience isn't really helpful.

Can't you use the smaller, "better" capacitor as a bypass on the one in there to good effect?

Kevin Carter
K&K Audio
www.kandkaudio.com

 

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