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Old 20th February 2010, 02:26 AM   #1
diyAudio Member
Join Date: Jan 2004
Location: Minnesota
Default ecc99 with which Interstage Transformer?

I am planning on using the ECC99 at the 150vdv -4v 18mA operating point.

Looking for a good 1:1 IT to load it with.

I am probably going with the Lundahl stuff... but unsure which one?

Also, should I parallel the 2 sections of the ECC99 for 36mA?

finally, would a grid choke on the input make any difference?

Thanks for any help!

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Old 20th February 2010, 03:44 PM   #2
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Join Date: Aug 2005
Location: Seattle
Hi Richard,

I assume you are planning this as a single ended IT so my experience is only of general use to you. I have LL1660S IT's which I use with 6n6p in PP. I think the 6n6p is similar to ECC99. The IT upgrade was a nice improvement for me changing from a cap coupled LTP. Seems more lifelike and realistic. The IT's seem to provide better drive to the output tubes and the amp seems more powerful.

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Old 20th February 2010, 04:25 PM   #3
DougL is offline DougL  United States
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Location: Wheaton IL.
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If you want to use Lundahl transformers, The K&K forum over at AA is your best shot. Kevin is very knowledgeable about the products he sells. Having engineering support from a knowledgeable reseller is very cool.

Just a satisfied customer.

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Old 20th December 2010, 06:57 PM   #4
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Back to this post again.

Would the Sowter 9525 be a good choice.

paralleled sections on the ecc99.

using it to drive a mosfet source follower.
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Old 21st December 2010, 10:22 AM   #5
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Join Date: May 2007
Hey A-Geek,
Why not go for a transformer from bifilar-specialist Dave Slagle at intact audio. He custom-makes every transformer to its use.
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