Marshallized Express

[DaveWell]

Hi Everyone!

Here's is my new project ! A Marshallized Express !

Phenolic resin with cotton fabric reinforcement Board ... I like the look and color... Yeah! Vintage Look !!

Vintage Mullard Mustard coupling caps
Original Piher carbon film 70's and some 90's resistor from Spain
Phillips 22uF 25V Bypass cap
Parallel to the 0.0022 mustard a 0.0027 ceramic cap from a 1956 Hammond Organ
Vintage Marshall style 510pF silver mica Cap
Vintage Marshall ''Doogy Bone'' style 47pF Cap

OHMITE 25W 1000 Ohm
Uf4007 Diode
Phillips 10Uf 250V
VISHAY (BC) 9.1K
Vintage Marshall Style 25K BIAS trim Pot

ARS Filter Cap (DALY and LCR are discontinuous) and now Marshall use ARS
2 1956 100K 2W Carbom Comp (Main filter Cap to Ground)

Heyboer PT and OT Transfo's

UK Made Welwyn 1K 7W Wirewound EL34 Screen Resistors

PEC Potentiometer Canada's Best !
So !
If you Have any comment ( + or -) advice and Help ... Welcome !

Thanks Everyone !

[M Fowler]

I like your boards and components looks so good.

I'll be back when your back with more photos.

Mark

[tony hunt]

That's a real nice touch to take the time to quarter-round off the edges of the board.

[RockinRocket]

Wasn't what I was expecting at all from the title!
Non the less this is pretty cool!

[RJ Guitars]

Dave, I think you'll really like the way that OT sounds. Before the word got out that Pacific would make the TW trannies available to the common man, there were dozens if not hundreds of Wreck clones made up using the Heyboer tranny sets. These clones are among some of the very best sounding that you'll ever hear and really helped propel the DIY Wreck cloning effort into a frenzy. That particular OT is the 5.2K primary and I think you're gonna like it. Nice project!

[DaveWell]

Hi Rj,

I order a 6.6K...
Here's the spec of the OT , the HTS-5200 is a 6.6K primary according to this .xsl file come from Heyboer seller contact at Heyboer shop.
The .pdf file is from mojoTone Amp parts.
The Picture also from MojoTone amp parts, and you can see the HTS-5200 on it

What is the major difference in sound between a 5.2K and a 6.6K ?

Thanks !

[RJ Guitars]

Hey Dave, If Heyboer held to it's own convention, then the 5200 is the actual impedance of the primary -- 5200 Ohms. It's possible that they did not but I'd think maybe it's just a historical recording error since then documentation they gave you isn't from Heyboer or even the original seller.

It's most likely that this set was from a guy called Moose that also went by the name of Toneslut. He was the goto guy for Heyboer transformers back in the day and he passed along his Heyboer product line and his personal blessing to me to continue the sales about 7 or 8 years ago... maybe even longer than that.

I'll attach the documentation that I gives the the entire Heyboer/TW story. Either way, it's a great tranny. KF liked the 6.6K primary - hard to tell if he just used it because the very affordable Stancor A-3801 had a 6.6K tap or he chose the Stancor because he preferred that impedance. This has alll been highly discussed in many heated debates back in the early days of the TrainWreck pages.... but what it tends to do when you raise up the primary impedance a bit is bring out the mids and take some of the edge off. It's basically just getting a little less power out of the amp which was a nice match up for the Express circuit. There was some folklore at the time that the Liverpool was a 5.2K tranny in the originals but who knows for sure? In the final few he built he used the same Pacific with the 6.6K tap in both the Express and Liverpool builds. It's likely that almost every amp he built had some difference from any of the others, that's how he tended to work.

[DaveWell]

Thanks Rj !

I also note that the Pacific OT got the 11415 Id on it , and it's a 6.6K
I really whant to know the primary of this Heyboer OT... to Me, everything seem's to be a 6.6K...
What is the simplyest way to mesure it ?

[Mark]

I've heard the HTS-5200 was popular because it was bright, aggressive sounding and louder than the 6.6K version. The 6.6K value is correct though.

[DaveWell]

Work in Progress

[RJ Guitars]

That is looking really nice - sorta like the poster child for building a Wreck in Marshall chassis. Love those coupling caps!

I thought I had some simple document that would help you sort out the transformer impedance question... but it's not anywhere I can find it. However, if you really want to work at it you could follow this web guide: http://www.radioremembered.org/outimp.htm

I am going to put that on my list to ask Phil over at Heyboer. He is pretty open about this kind of stuff and I suspect he can tell us if that was something they did for Mojo and kept the 6.6K tap but left the label stating 5200 or maybe Mojo actually didn't know what they had? Either way I think he'd tell us. If I recall correctly MoJo has stopped selling those the Wreck trannies. I have been buying the Pacific OEM part # at a great price and it's much more popular so I dunno if there is any market left for the Heyboer versions these days. Too bad, I really think they make good stuff.

[DaveWell]

Hi
For the heyboer.
What wire gose to V4 and V5 ?
Blue is the center Tap, but I'm not sure for the Green and Purple
I think Purple go to V4 Ang Green To V5, But need confirmation
Thanks

[pompeiisneaks]

If you don't have a document showing it, you better be sure which is the center tap. If you're sure then it doesn't matter which on you use, you'll know if you did it wrong, when you first power up the NFB will cause major squealing or crappy noises if you have them out of phase (it becomes PFB instead) and then you can just swap the output tubes for the wires. This is the easiest test to do, and you have a 50% chance of getting it right

I think, on the other hand, if you hook up the CT instead you may have some serious problems. That's why I said to be 100% sure which is the CT.

Edit: just noted the diagram above and it does show blue is CT on that one, if that's the one you're using. So yeah, just hook them up, leave a lot of extra lead, so you can swap them if you get it wrong at first, then cut them to size after you're sure you have the phase right.

~Phil

[RJ Guitars]

Exactly what Phil said - especially the leave a little extra wire part. Once you get the phase thing sorted out then you can trim them up and you're set for life.

[DaveWell]

Ok ! Good
The Blue one is the Center Tap.

Pacific and Heyboer have the same wire color in the schematic
Gonna try wired it like those picture I have

Thanks