Re: Tin Man
MarkS
"flipper" <fli...@fish.net> wrote in message
news:n3gti5t5vu7i0td6a...@4ax.com...
> That's what I'm thinking of calling the little 45B5 SE amp I just
> finished because of it being built on a medium loaf baking pan upside
> down on a thin wood plank with feet. Looks a little like sonny
> 'borrowed' mom's baking pan and bread board to make it. hehe
>
> The only problem was that the baking pan's slope and lip precluded
> using the drill press on the sides. That and mounting the OPTs to
> where it was almost, thank goodness only 'almost', impossible to get
> the upper mounting screw in. Plenty of room for the screw. It was room
> for fingers to hold the nut that was short.
>
> Power out came to a little more than the 3 watts I was hoping for,
> almost 4 Watts.
>
> Some may recall that Circuitmaker's transformer model didn't work
> right but the workaround gave good results in predicting a 158V B+. It
> came to 163V but AC runs a tad high here so that's dern near spot on.
> Filament DC came out 113V vs the 110 target. Close enough for
> government work. No 'mods' needed. It just worked, as modeled.
>
> Idle current came out 69mA, again spot on. Speaking of which, I didn't
> have a 45B5 model but as I was looking at curves to pick something
> 'close' I discovered, by golly, the 45B5 is a 6CW5 with a 45V heater
> and that I did have a model for. In theory you could make a 13W-25W PP
> amp with these things, depending on how B+ worked out and whether you
> could find the right OPTs. In fact, 6CW5s are what I used to make
> nephew's guitar amp. For that one I used a power transformer as OPT
> since you don't need a 'hi-fi' top end.
>
> Total cost, 'all new', for Tin Man came to 75 bucks and I think one
> would be hard pressed to make something for less.
>
> Cute little thing. It's going to be a 'PC Speaker' amp, complete with
> my 'world famous' dual input jacks so you can use SS speakers for
> windows bleeps to conserve tube life, Christmas present to my brother
> in law.
From transmission pans to loaf baking pans; yikes! This group is nothing if
not creative. Post some pixs on ABSE if you have moment to do so.
Thanks,
Mark
John Byrns
flipper <fli...@fish.net> wrote:
> Hehe. Well, you have to use the 'right kind' of baking pan, of course
> ;)
>
> Funny as that sounds, the pans at the local grocery store had a
> reinforcing bend around the bottom that wouldn't allow placing the
> tubes and transformer mount there so I had to find one that was
> *flat*.
>
> I had originally planned to mount the internal OPTs on the horizontal,
> which would have been a hell of a lot easier, but the walls are rather
> thin and I was concerned that, over time, they'd bend.
>
> > This group is nothing if
> >not creative. Post some pixs on ABSE if you have moment to do so.
>
> Done. I posted an outside and inside view under the title "Tin Man
> Tube Amplifier pics for RAT."
Hi Flipper,
Might I ask where you posted the "tin Man" pictures?
--
Regards,
John Byrns
Surf my web pages at, http://fmamradios.com/