[Harp-L] Re: Weber 5F2H Harp Amp

[Jim Rossen <jimjimdr@xxxxxxxxx>]

To determine if the power tranny is bad in an amp that blows fuses-
Power it up without the recto.   If fuse does not blow, there is
probably a short in the high voltage circuit, the recto tube socket or
the recto is bad.
If the fuse still blows, the final test is to disconnect and isolate
all of the secondary windings and retest. This can be done
sequentially or all at once.   If the fuse still blows with all of the
secondaries disconnected, the PT is bad.

Weber VST sells circuit breakers that can be alligator clipped into
the the AC supply for this testing to avoid the expense of multiple
fuses.


On Oct 28, 9:21 pm, "steve warner" <10reedsb...@xxxxxxxxx> wrote:
> Hey Scooter,
> Thanks for the heads up, but knowing Ted's tranny's and how the % of PT's
> that have blown I just assumed it was the PT.  (you know the old saying,
> though?  ASSUME= will make and ASS out of U and/or  ME.....lol)
>
> I've had the original 5Y3GT in there and the last time I checked it on the
> Hickcock, all was fine so that's why I figured it was the PT.   I checked it
> again and is within good spec parameters.  That RCA is a great sounding
> T-R.  Now, since your post (it got the best of my curiosity) I pulled the
> 3A-250V fuse from my old Alamo and put in a Copper Cap WY3GT and the fuse
> blew in 1 second.   Kinda sucks because I can't seem to  find any fuses in
> my stash, so now I have to jump my Allied Knight PA over to one of my 3
> remaining amps that all have no fuses in them.  DOH!!   Or head to the
> store.
>
> The Harmony 305A is very close to a Tweed Deluxe circuit, but it has a bit
> more headroom. I made a few minor changes for bigger low end and with  a
> real hot and bright element  this amp sounds very very good....5 years ago
> on ebay for 162 bucks.  Another 110 bucks- 101A100, PT, a few caps and R's-
>  and it sounds like my friends Tweed Harvard in a blind A/B.
>
> catch ya later,
>
>
>
>
>
> On Mon, Oct 27, 2008 at 7:42 PM, 10hole <10h...@xxxxxxxxxxx> wrote:
>
> > I'm not farmiliar with the circuit Steve but if it's tube rectified, check
> > out the rectifier before you buy a new tranny.
> > That's another given when blowing fuses, If the rectifier arcs, the fuse
> > blows.
>
> > Good luck,
> > Scooter
>
> > Hey Rick,
> >> Remember how I was talking about Weber's Asian Tranny's?  Well, my 61'
> >> Harmony 305A isn't used that much at all and I've had one in there for
> >> about
> >> 4 years now....WELL.....it blew 2 fuses today, which usually means the PT.
> >> There ya go.
> >> Sucks because that's the map I use for all mic testing and I just finished
> >> San Pedro SLim's mic and with the low end I've induced into the circuitry
> >> it
> >> allows me to test for the brightness and grind factor in certain elements.
>
> >> On Sat, Oct 25, 2008 at 6:31 PM, steve warner <10reedsb...@xxxxxxxxx>
> >> wrote:
>
> >> Ohhhh yeah!  The 12F125-0 is a good one with very big low end!  Check this
> >>> out....I made a 5F2H with 2-10's...1--10F150-0 and 1--10A150-0 and an
> >>> even
> >>> slightly bigger OT.  I made it for
> >>> >http://bluesharpamps.blogspot.com/2008/10/weber-5f2h-harp-amp.html
>
> >>> > A comprehensive review with sound clips will follow next week.
>
> >>> > -Rick Davis
> >>> > The Blues Harp Amps Blog
> >>> >http://bluesharpamps.blogspot.com/
>
> >>>  > _______________________________________________
>
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> >>>>> --
> >>>>> steve
> >>>>>www.thunderharpmics.com
> >>>>> fattest tone on earth!
> >>>>> _______________________________________________
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> >>> --
> >>>  steve
> >>>www.thunderharpmics.com
> >>> fattest tone on earth!
>
> >> --
> >> steve
> >>www.thunderharpmics.com
> >> fattest tone on earth!
> >> _______________________________________________
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> --
> stevewww.thunderharpmics.com
> fattest tone on earth!
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