Help with putting original 1204-43 PT back in it 66 45/100.Quick LP clips of low quality added to close out !

[TAZIN]

Isn't the connections for this PT as follows...
Flying leads: Brown = 200/210
Red = 220/230
Orange = 240/250

The side of the PT with four solder terminals: The somewhat isolated terminal is for AC common.
The next one is H.T. B+ (secondary).
The middle of the group of three is H.T. center-tap (typically connected to H.T. Fuse).
Last of the three is H.T. B+ (secondary).

The other side with the six solder lugs should be as follows:
First two are for the one leg of the Heaters (Black).
The next two are the Heater center taps (Green).
The last two are for the other leg of the Heaters (Red). This pair is across from the AC common terminal.

 

[neikeel]

Good info there, particularly now you have a variac.
I suggest in the first instance just apply low voltages (like 10% of normal input)
So apply 20v to the common - brown wire and measure:
- the heaters and expect 0.3vac to common and 0.63 vac between the outers
- expect over 40vav plus from the HT to CT and 80vac across outers
If the other primaries are correct you should get the same readings as above if you put 220v on the red leads
and 240v on the orange wire

That way you don't shock yourself with anything significant but still confirm what each set of lugs is.

 

[Whatwhatringrang]

Thanks so much guys . I do not have my notes on me but all checks out with everything. Did it as instructed here on every self lead and all voltage numbers are about the same as given . A touch higher than numbers you mentioned Neikeel (a little bit higher on this one ). Within about 5% at full voltages 200,220,240 . Raised to full voltage there slowly and checked if everything was like the lower voltage .

When it’s not crazy around here and I can concentrate . I am gonna carefully put it back in . Triple check everything and then slowly raise to 240v . Check all the voltage lower and then finally higher. Rebias after checking heater voltage and all else.

I appreciate your time and help TAZIN and Neikeel ! Also everyone else who popped in here and contributed . You all really helped me out here thank you!

 

[Whatwhatringrang]

Put the original back in it . Sounds/feels amazing with old quad of kt66s. Really did not expect the sonic results I hear in doing this swap (atleast in my own ears/head lol). Could not be happier with the results in everything now. Thanks 🙏 again guys and I really appreciate it.

I will give it heavy use for a couple months then possibly sell the C.M. transformer . All correct spot on range voltages With numbers compared to others and schematic(with the old one in there) . I believe right off the rip I am happier with it . However it comes at a cost compared to just plugging the Merren into the wall. Step transformer into variac (300vac one),then amp into variac. However I do this anyhow on pre 68 ones especially this version of the amp.

Thanks for all your help and let me know if I can do anything for helping me here. Merren stuff is always great in the amps I have had that used them.

Pics here for anyone insterested. Old original

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The Merren transformer

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All good and interesting to me the sound changes and feel differences (please feel free to think I am full of it with that lol). Here’s some pictures with original transformer and the C.M transformer out of it . Very pleased with the results and have been wanting to do it for close to a year. I admire Merren‘s excellent hard work with a with his transformers I have had in his amps and especially seeing everything on his site. If anyone one wants dibs on it give me a month or two just in case .

It is interesting trying the different taps on the Merren and the results through the last year. Started with the 460 taps up to 560 taps on that one . Have been using the 560 recently with it when it was in there.

Side b.s
I can not believe a honest seller originally with this one all the way around. So I really recommend The guitar shoppe in Laguna Beach and their tech they use. Tech wrote a honest thing of all done and why. Also included the original old tubes on the side and few little parts changed in the deal that needed changed . I get why they opt’d with the repro.

. With most new production tube it is just much more convenient and user friendly using the lower taps . Not to mention the different voltage there to try. Also just plugging straight into wall 120 in the states is of course awesome .

I will post some clips of this one in sometime some ,as i think it is a great one sound wise. Probably one of my favorite sounding ones I own (this style one). I disconnected Pa part awhile ago and added mixer cap and bright cap on volume 1. So pretty much just stock 45/100 but can easily be put back. Thanks again forum members your knowledge and helpfulness make the world better ! Really happy with results of putting the original pt back in!

 

[neikeel]

Good work
Looking forward to your clips
Can you humour me and put that HT fuse inside the chassis not on the top?!

 

[Whatwhatringrang]

Neikeel I am flipping that fuze over to the bottom this morning . I guess better safe than toasty lol .

A couple Les Paul into cable into amp clips with the amp stock lead set up for late 66 period . Disconnected pa section and pulled the tube . Except with 470k resistors ,rs 560pf cap there and the 100 pF bright cap for now. Using a power brake 3 clicks back into both 67 tall bottom with June 67 speakers and 1982a with the early June 67 25 watts in that. Full thing stack and turned up . A thanks again to TAZIN ,Neikeel and everyone Else who helped. Around 561 plate voltage on this one . I will just erase these when I get something decent up . I like to have my bass control up a little more . Same old same old. Also get some Strat clips up and just single high input sound. As i know y cable is a certain sound of many these can have . This thing sounds great with a strat on about 6 or 7.

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Cabs not the same head.

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Quick little clip and right when it starts you can see it all on this first one.

Same rig but his using a lot of neck pickup tone rolled off and volume back a touch on pickups.

 

[vogonpoet]

Yep, that sounds about right!

 

[neikeel]

Yep sounds good, just a hint of ghosting which is quite typical but play on through it and it all adds to the mojo

 

[Ramhead]

Quick little clip and right when it starts you can see it all on this first one.

Same rig but his using a lot of neck pickup tone rolled off and volume back a touch on pickups.

Nice playing and sound! In the second clip It sounds like you play through a low Octave pedal..

 

[playloud]

Neikeel I am flipping that fuze over to the bottom this morning . I guess better safe than toasty lol .

A couple Les Paul into cable into amp clips with the amp stock lead set up for late 66 period . Disconnected pa section and pulled the tube . Except with 470k resistors ,rs 560pf cap there and the 100 pF bright cap for now. Using a power brake 3 clicks back into both 67 tall bottom with June 67 speakers and 1982a with the early June 67 25 watts in that. Full thing stack and turned up . A thanks again to TAZIN ,Neikeel and everyone Else who helped. Around 561 plate voltage on this one . I will just erase these when I get something decent up . I like to have my bass control up a little more . Same old same old. Also get some Strat clips up and just single high input sound. As i know y cable is a certain sound of many these can have . This thing sounds great with a strat on about 6 or 7.

IMG-1674 hosted at ImgBB

Image IMG-1674 in Marshall pics album

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IMG-1673 hosted at ImgBB

Image IMG-1673 in Marshall pics album

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IMG-1676 hosted at ImgBB

Image IMG-1676 in Marshall pics album

ibb.co

Cabs not the same head.

IMG-4941 hosted at ImgBB

Image IMG-4941 hosted in ImgBB

ibb.co

Quick little clip and right when it starts you can see it all on this first one.

Same rig but his using a lot of neck pickup tone rolled off and volume back a touch on pickups.

So cool! That neck pickup is just sublime

Did the Merren have the sag/ghosting too?