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Old 19th April 2003, 07:43 AM   #1
SHiFTY is offline SHiFTY  New Zealand
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Default Leak TL12 replica using 807s?

I am thinking of building a stereo version of the Leak TL12, but using 807s instead of the triode-connected KT66, and 6SN7 instead of ECC33.

I have a couple of fire-engine red Mullard EF37A lying around, and some output transformers that should be ok.

Would this work, or would I be running the 807s too hard? Would I be better off connecting the outputs as ultralinear instead of triode?


Anyone have experience with this amp? It seems to have a very good reputation! Thanks.

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Old 19th April 2003, 12:37 PM   #2
EC8010 is offline EC8010  United Kingdom
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Default Go for it!

I believe that Langford-Smith (He of RDH4) got away with making a Williamson using triode-strapped 807 instead of triode-strapped KT66, and the output stage conditions are virtually identical, so you should be OK. If you leave a little room around the output valves, you could always change later to KT66 if it proves necessary.
The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...
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Old 19th April 2003, 04:14 PM   #3
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Would this work, or would I be running the 807s too hard? Would I be better off connecting the outputs as ultralinear instead of triode?
Actually I've done this kind of work on a few Leaks already years ago.
While I left the input tubes in place (they last forever anyway) I changed the sockets of the KTs to UX5s and put in 807s in triode mode.

Worked straight away and sounded fine too us.
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Old 19th April 2003, 04:55 PM   #4
316a is offline 316a  England
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Default 807

Another alternative would be the loctal based 5B/255M which was designed (I believe) as a 'miniature' 807 replacement . This does not require a topcap and is another cheapie . Topcapped version is the even cheaper 5B/254M or 20V filament versions (5B/258m?) can be had dirt cheap . Only disadvantage is that ITT/STC were the only manufacturer , the 807 is more widely available and therefore cheaper

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