Fender DeLuxe Reverb Power Transformer

1968 DR reissue,  my friend Larry was knockin out the country chops at the local casino, you know the game,  4 sets,  fri and sat,  45 on, 15 off, split up  $1200  and run past the tables on the way out,  well, all of a sudden it's lights out, nobody home.

power transformer take-a-part here we go,  de-lam complete, shim it up on a would block,

   

outside layer lead breakout,

inner lead breakout, no problems yet,

6.3 VAC  19 T #18  AWG

which lead is the start and which  lead is the finish? does not really matter, but would be nice to know,

can not tell on a single layer wind, have to compare wire direction  with the HV sec or 120 VAC primary,

this layer has to be well insulated as it sits on top of the 5 VAC rect wind which  has high voltage AC superimposed on it for the B+ supply,

5 VAC wind, 14 turns of #18 wound bi-fi.

why? don't really need the current, only gotta heat one tube,  probably just to fill out the layer so we have a flat table for the other stuff, seems like a waste, why not use paper instead?

the start for this wind was opposite the start for the 6.3 wind, why? probably to keep the outer wind from sinking into the gaps, the angle of the two winds will criss cross each other, pretty neat trick,

red/blu bias tap starts on the right and finishes into CT splice, polarity does not matter as the tap goes to a 40007 diode,

103T  #30-31 ish  AWG  .011"

next wind in is the secondary, 900 turns of #30-31 times two as this is a full wave and not a bridge circuit,

inner section has a hump in it, i bet that is a fuse, i bet the fuse blew, i bet we will rewind without the fuse,  i bet the fuse never stalls poor Larry out right in front of the crowd of Jones and Hag fans, i bet nobody throws beer bottles at Larry again, i bet they save enuff on chicken wire to buy a new set of half-wounds for the bass player, 

primary fuse tunnel,

hash shield between primary and the rest of the winds, we can probably salvage that and save another airplane trip from evilbay,  that, lead gets stuck in core,

paper tube for the thermal fuse which is supposed to reset,

no wait, no reset on fuse, wtf?  ???

Fuse is Sefuse SF-139E-1

http://files.microjpm.webnode.com/200004749-ae3e0af380/SEFUSE%20SF%20SERIES%20Datasheet.pdf

down to the wire here with a 320 turn primary, feels like #22 AWG,

a cross over at the very start of the wind,  not a good way to start off a coil, oh well, the problem was the fuse,

i bet somebody was working fast on a multiple coil machine, and did not notice coil #3,

so 900 T / 360 T = 2.8 so 2.8 x 120 = 337.5 Secondary VAC,  before losses,

the rectifier will chew maybe 37.5 volts so figure 300 x 1.4 = 420 V-dc minus losses for DCR,

DCR is 118 ohms (secondary) so 100 ma x 118 = 11.8 volts voltage drop, what is power loss?

.1 x .1 = .01  x 118 = 1.18 watts,  not enough to set off a fuse, so maybe the transformer is sitting  close to the tubes,

core tube, surprised this was not bobbin wound,  trying to go old school so they can put that on the brochure, 

core is 125 EI, 1.5" stack, gonna do a print...

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