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This one followed me home from Vancouver last weekend.
Haven't had a chance to fire it up at home yet, or do any clean up or de-modding, but it sounded nice and HIWATT-ey when I tried it, albeit with a bit more gain than my '103.

Out of its shell


The Candian Importer "Sharpie Mod"




Note one output valve base recently replaced... needs a vintage-correct base




Recently re-capped & re-tubed... needs some good NOS glass and a proper bias mod


Note 120v mod terminal strip - that might go away


Canuck importer gain mod... it's gotta go

Nice addition - congrats!

Gee, the chassis looks so clean with all the caps on the underside.

Dave

Nice PCB amp !!!! It looks a lot like the PCB DR504 i posted about----- mine is serial # 15104........................gldtp99

Looks great.

OldSchoolDave wrote:the chassis looks so clean with all the caps on the underside.

I know, it's a shame they didn't drop the heat shield at the same time! There is absolutely no need for it with all the cap cans inside (unless you *like* forcing people to remove the chassis to change preamp tubes! ).

--mark

A few more pics:

Got curious to see what brand/rating was used when it was re-capped. Well, shiver me timbers! Those are honest-to-goodness UK LCRs. OEM specs, no less... including a 16uF+32uF.

Sweet..... THAT'S the way to build a PCB amplifier.......

Meet the "Twin Terror" halfstacks

<-- DR103 clone + '75 SE4123 w/ (2) Fane 122231 and (2) Weber Thames
--> DR504 #14872 + Reeves 4x12 w/ (2) Fane 122142 and (2) Weber Thames

I'm liking them... a lot!

mikhailwatt wrote:I'm liking them... a lot!

How do the neighbors feel about them ?

Dave

Just tell you neighbors they're not for sale. They got nothin', they got sweeeeeeeeeeeet f*#k-all.

OldSchoolDave wrote:How do the neighbors feel about them ?

No problems - our studio/rehearsal room is on the third floor, and we have some space between us and the neighbors... my son's band has hit 117dB up there - they use earplugs.

Haven't had a chance to really crank the "Twins" yet.
I can tell you, though, that the '504 sounds very "classic" now after the de-mod/de-fizz procedures.

Hmmm... the previous tech with his paralleled bias resistor scheme had the thing biased down to about 12mA! Playing it safe, I guess?

Anyway, removing the superfluous resistors got it back up to a respectable 38mA or so. With some good NOS glass in there it sounds great! Less loud than my '103, for sure...