Richard's PL Beastie Rework

[Richard D]

If I ever get my brother straightened out, I will have a vintage Wurlitzer bubbler.

 

[laatsch55]

What is that??

 

[jbeckva]

Wiring just about done. Should be putting in the DCP and then we get the outputs and heatsinks back on.

 

[Richard D]

I really wish I had the skill to do nice tidy wiring. I just got my phase converter hooked up and my milling machine running this week, it's been here six years. I am so ham fisted when it comes to even simple electrical work.

 

[laatsch55]

What kind of mill Richard??

 

[laatsch55]

It's a learned skill. Took me a few years. Wiring all my company's water plants and production wells helped. Just the sheer volume of wiring a fella had to get better.

 

[Richard D]

What is that??

1946 Wurlitzer model 1015. Pretty much the PL700 of jukeboxes. A restored model is worth thousands. Don't start looking at them, if you are like me, you already have enough huge expensive obsolete stuff around.

 

[Richard D]

What kind of mill Richard??

1968 Millrite. It's a true knee mill, not a mill-drill. Made in Cincinnati, they are often called "Baby Bridgeports". All the features of a Bridgeport , but a bit smaller. Mine has a 36" table.

I also have a 1934 Southbend 9" tool room lathe I restored, first year they made them.

 

[laatsch55]

Our machine shop has a half dozen Bridgeports. A lot of Monarchs made in the 40's, Some cincinnati's. Lot of machine tools. My partner was the eldest son of a guy that started a machine shop here in Gillette in the 60's. Wandler has not been without machine tools since.

 

[Richard D]

I'm building a pretty cool modular welding/fabrication table. I'll post some pictures on the Tomfoolery section when I get a bit further along...

 

[laatsch55]

I'd love to see it.

 

[kevin]

I really like this thread !!! Good one.... Richard ! You and I got a lot in common.... I got an Ultra calssic sitting in the garage.... got a 1976 AMF sporster with the shifter on the wrong side that I want to restore !!! Fooled with cars all my life and sell them for a living !... Love great stereo gear !!!! Electronics blow my mind .....I know nothing about it.... Electricty I can handle.... So gald you found this place man !!!! You are getting ready to get your dream amp man..... Dont get no better than that !!!!! I remember when I got my 700 that Lee built for me !!!! What a monster it is !!!!! Those 901's are going to be so loud !!!! Get ya some kind of big 15 inch sub and put with those things !!!! Look forward to talking with ya soon !!!! I've hushed ! Gotta go find SUPER-MAN !

 

[jbeckva]

Whew! So now the inside's pretty much wired up. Inputs, DCP, output busses... Tomorrow we get the transistors in and wire up the WO board. Soooon... very sooooon....

Lee that rev "A" DCP had me scratching me head a lil. 8 terminals instead of the normal 7, LOL!

 

[laatsch55]

Lee that rev "A" DCP had me scratching me head a lil. 8 terminals instead of the normal 7.


???????????? Wasn't aware there had been a major design change..

 

[jbeckva]

Lee that rev "A" DCP had me scratching me head a lil. 8 terminals instead of the normal 7.


???????????? Wasn't aware there had been a major design change..

Yessir - Pin 5 isn't in use, 8 total on this rev. Don't forget the reroutes on the backside... heh.

Had me doing a double take until I did a few measurements.

 

[laatsch55]

That's right that was DCP #1. I remember now.

 

[jbeckva]

It LIVES!

All outputs in, bias Q's situated, all control wires replaced with the "good stuff" and the WO board is wired up!

What a lotta work this guy has been so far, but hey... it passed the "DBUST" (that's a new acro I made up for "Didn't blow up shit test" )

Initial measurements, variac removed and on line AC:

Offset - both channels, about -5mV
Bias - 380mV
Rail Voltage - 107.4 VDC (yoooowwwzzz this really is a hottie, eh?)

 

[laatsch55]

107.4, more like 520 per....

 

[Richard D]

Great job!

 

[jbeckva]

I'm listening to it! Not too shabby. Great sounding amp. Just a couple of bugaboos I need to work out. First that gen "a" dcp gots me confused again... seems it's lefts and rights are different from the current stock.

Big one tho... the power switch will scare the bejesus out of you because of the inrush current. Serious SERIOUS "POP!!". I almost thought I had something wrong there, but has to be the arc across the switch doing it. I should probably replace it.

Looks like we gots a funky meter too. Way twitchy and oversensitive. Isn't there a way to tweak on it to get it to behave?

Soundwise tho.. nooot bad, not bad at all!