[Jukebox-list] Wurlitzer Amp Blowing Fuse

[Don]

Well.
Bill.
I am gonna get shot for this, but.......

Put in a 30 amp fuse.....   put eye protection in place
Turn on....
Look and smell for smoke.....  :-(

GUARANTEED y'all   'll  find the problem..... fast.

Question is....
are ya prepared to gamble on destroying something in the process..... ????
on the other hand, maybe it is already "destroyed" or shorted.

Good Luck
.... and even tho I am 1600 miles away, CALL ME just before you turn on the 
power.... 604-824-5711

Cheers
Don

-------SERIOUSLY,  why waste any more time, blow it up (wear eye protection)
------- we expect a full report, and YES, spelling will count.





----- Original Message ----- 
From: "Bill Taylor" <bt_2627 at yahoo.com>
To: <jukebox-list at lists.netlojix.com>
Sent: Wednesday, September 27, 2006 8:02 PM
Subject: [Jukebox-list] Wurlitzer Amp Blowing Fuse


> Hi Guys,
>
> I've been stuck on a problem for a month and can't
> find what's causing my fuse to blow.  I'm working on a
> Model 1900 with a model 530 amp.  When I start the
> amp, the tubes begin for a couple seconds then the
> Fuse F4 (2Amp) blows.
>
> If I pull a lead off C-35A (directly to the rectifier
> 5U4 tube), it doesn't blow.  The cap (30mfd 500v)
> charges from an ohm meter, but it could be bad so I
> bought a new one (although my part source said they
> can't get that cap, but use a 47mfd 450 instead that
> they've used OK).  I put on the cap, but same problem.
>
>
> So I started to isolate the circuit.  When I was done,
> all I had still in the circuit was the output stage
> with 2 6L6 tubes push pull ciruit.  Still blows.
> Pulled out the tubes, the C-35D cap, and R-77/78  so
> thats nothing left except the rectifier, the C-35A
> cap, resistors 69A/B (all the big watt resistors), T-1
> and T-3.  Still blows after 3 or 4 seconds as the cap
> starts charging.  Blows at about anywhere 250-550
> volts.
>
> I looked for any grounds other then the one at the
> R-69A/B and they are all isolated.  Both R-69A/B
> resistors ohm out correctly when passively tested.
>
> I'm lost at what to do now.  Anyone with ideas?  Do
> you think a transformer can cause a problem like this?
> Could those big 15 watt resistors short under load?
>
> Any ideas, I'm listening!
> Thanks!
>
> Bill Taylor
>
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