Union Jack Guitar Amp

[CJ]

let's blog out this Union Jack designer label amp and see what happens,

two volumes and a tone, easy to operate,

 

[CJ]

nice chassis, a pair of Russian Tungsol's, 5Y3, a couple of 12AX7'a,    SBE caps,

 

[CJ]

Magnetic Components for the pwr and OPT,

 

[CJ]

chassis

 

[CJ]

anther amp with old style resistors, just did a Splawn with those, who copied who?

 

[CJ]

pwr section, more copper buss wire and a 1K bias resistor, pwr xfmr has bias tap taped up,

 

[CJ]

we did a speaker swap and installed an attn box, simple resistor ladder with a 4 pos knob,

here is the old C12N,

installed a Weber AlNiCo and a Z amp load box,

 

[CJ]

where's the beef?

ok, alright,

here it is, single tube inverter,

OPT- 875 EI sq stack, DCR on print, wound Pri-Sec,  38:1 turns ratio, probably about 2,000 turns pri and 52 sec,

voltages included at no extra charge,

any questions?

yes it sounds alright, 6V6 self bias is hard to screw up, Jensen spk was better, but customer always right,

ok then,  that's a rap

 

[JohnRoberts]

is a rap a wrap?

JR

 

[CJ]

yes, tweed wrap.


transformer links>

OPT
http://www.classictone.net/40-18022.html


pwr
http://www.classictone.net/40-18066.html
http://www.classictone.net/40-18066.pdf

layered paper vs nylon bobbin argument>

http://www.classictone.net/PaperVsPlastic.html

 

[PRR]

> single tube inverter,

I suspect the volume/tone network is drawn wrong.

I think this "IS" the classic Fender (Deluxe?) with minor value changes. Even the 56K on the cathodyne sounds like a Fender choice.

 

[CJ]

<I suspect the volume/tone network is drawn wrong. ..> 

they say neatness is conducive to accuracy, so why not splice values onto the 5E3 schemo?

that 1 K 6V6 bias resistor is kind of weird, maybe meant to offset the plate voltage a bit, as 440 is pushin it,