http://www.a1radio.com/Schematics/6LE8_ ... _v.1.1.pdf
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I posted this clickable link because I've been giving my version of 6888 history to newbies lately. They should search 6GY6 also.

Here was my contribution to the 6GY6 - 6C4 (or 6AB4) 2-Tube model:

http://www.km5z.us/files/Two-Tube%206GY ... mitter.pdf

Writeup with 6AB4 here:
http://www.km5z.us/2-Tube-AM-Broadcaster.php


Mike Y
Dallas, Texas

Thanks for posting that Mike. The 6888 based broadcasters have an evolution that is getting confusing at first to newbies because there is so much history of it now.

Yes, perhaps we need a geneology line, although I'm not sure I know all the 'parents'.

6888 --> 6LE8
|
+--> 6888+6AB4 variant
|
+--> 6GY6+6C4/6AB4

There are the 'red-headed' stepchildren, of course... The Compactron version. The 6CQ8...
I just found a couple of 6CQ8's on eBay. I'd like trying that Controlled Carrier version just to see how it sounds.

My favorite, however, is the 6GY6+6AB4. Could just be the convenient enclosure (Blonder-Tonguer UHF Converter). But the 6888+6AB4/6C4 is swell as well.

Mike Y

I'll let you fill the branches on the tree.

First was Norm's 6888, next I built two of the 6C4(6AB4)/6GY6 variants, one using the Xtal osc the other with a VFO(a 12AU7 is used for the 1st audio & VFO)... Then came the 6LE8 version, I built the cakepan prototype and helped Timo with the details on his build in a R/S project box, he did all the writeup... It gets a bit muddy at this point but in early '07 I built a low B+ 25L6 version with some similaries to Norm's 6888(Probably should not be classed with the dual control types)... You built the dual xfomer 6AB4/6GY6 version, that Bill was going to stock parts for but the transformer supply dried up and Norm located the transformer I designed the 12AV6/12CS6 around...

As for the redheaded stepchildren, there is the one tube Compactron 6AB11 that's similar to the Xtal osc 6C4/6GY6 and also the 4DT6/9KC6 variant(actually two of those)... Additionally I built a four tube 6GY6 with a cathode follower(chassis had a empty socket I wanted to fill) and a couple prototype plate modulated versions that never have seen a final build(not really 6888 typr xmitters)... There is a low B+ (24/30v) 12AU6/12EG6 I built early in '10 and finally(I think)the 12AV6/12CS6 Bill is stocking as a parts kit now...

BTW I tried searching the 6AB11 & 9KC6 versions to see when I originally posted info(maybe never on the 6AB11) but the search function here on ARF is useless as tits on a boar hog...

Tom

I was going to mention 6AB4 but 35Z5 beat me to it. Thanks to 35Z5 for posting it all.

Just to carry the "genealogy" a little further, with both of mine I used 7AK7's and 9002's (both I had or were cheaper). Still great sets in UHF converter boxes as mine already had power transformers.

Dale

There are the 'red-headed' stepchildren
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Speaking of those, I just looked at what's leftover from every kit I ever stocked parts for. Low and behold I have a qty of 6CB6. I can't remember what they were for but I'll bet 35Z5 can.


P.S. I also thought that playing with tank circuits along the way was fun homebrewing. Can anyone post something on here about the toroids and/or slugs for 6888.

I used Miller 71 coils on a couple of mine. I had them and they had quite a bit of ajustment.

Doug.

I used Miller 71 coils on a couple of mine. I had them and they had quite a bit of ajustment.

Doug.
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Timo also used Miller 70 series in the 6LE8 thread in the first post on here because tubesandmore stocks a new replica.

http://www.electronixandmore.com/project/10.html
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Another members 6AB4/6888 scroll down to second schematic

Wow, a lot of stuff going on here !
I was thinking of taking my nephew under my wing and build a 6LE8 version with him. The reason I pick that version is I am familiar with it as Bill Hamre coached me thru it and I kinda remember it as my first radio project

Bill, do you still have them kits ? A while back I tried to look for all the info I had for mine and I couldn't find it, just a drawer of leftover parts (sometimes radio shack sells things in 2 packs) plus I bought a bigger board than needed and could make another with the half I have left. Is that stuff still floating around out there for the 6LE8 ?

Dan

Just to carry the "genealogy" a little further, with both of mine I used 7AK7's
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I think one of the designs along the way had no harmonics. Anyone remember. It might have been the 7AK7.

is that stuff still floating around out there for the 6LE8 ?

Dan
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I have enough parts left over to get you at least 75% of a 6LE8 kit and I think all of the harder to get parts. You might need a few resistors from Radio Shack. PM me with a mailing address.

I was thinking of taking my nephew under my wing and build a 6LE8 version with him.
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Can anyone send Dan a toroid to try while he elmers the nephew.

EDIT: I found a toroid core (F-82-61) and mailed it to Dan

Pm sent Bill,
Thanks !
Dan

Thanks Bill
Dan