LL1660 /18ma as SE--->PP with 2c51/5670

K&K Audio / Lundahl Transformers

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In Reply to: LL1660 drivers wanted. posted by PeterP on October 21, 2002 at 19:30:17:

I use the LL1660/18ma as IT Splitter in my PP KT88 amps and it works great.
This configuration can't be found in the datasheets, it's a combination of Alt-S(primaries) and Alt-T(secundaries)
As driver I use a paralleled 2c51/5670 (separate cathode resistors) that is biased at 14ma.
I use the secundaries as primaries and vice versa,
they're connected as:
primaries: all in serie (alt-S) Bplus-4, 3-5, 2-7, 8-10, 9-anode
secondaries: for PP (alt-U) gound-13-18, 16-grid1, 21-grid2
I asked the Per Lundahl for the specs of this configurations:
Primary inductance approx 70H
Suggested source impedance not above 7.5k for same LF response

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Follow Ups Full Thread

Topic - LL1660 drivers wanted. - PeterP 19:30:17 10/21/02 (4)

LL1660 /18ma as SE--->PP with 2c51/5670 - Danny T 09:19:37 10/31/02 (0)

Re: LL1660 drivers wanted. - KevinC 04:51:08 10/22/02 (0)

Re: LL1660 drivers wanted. - 45drive45 01:37:00 10/22/02 (1)

Re: LL1660 drivers wanted. - danzan 02:09:29 10/22/02 (0)

Follow Ups

LL1660 /18ma as SE--->PP with 2c51/5670 - Danny T 09:19:37 10/31/02 (0)

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