Jen (Gretsch Playboy) - Harmon Booster  [schematic]

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...

Re: Jen (Gretsch Playboy) - Harmon Booster

Postby azrael » 09 Mar 2012, 21:28

I looked up the BC318C, it's PNP? Do you just build it with a modern transistor that's NPN?
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Re: Jen (Gretsch Playboy) - Harmon Booster

Postby mmolteratx » 09 Mar 2012, 23:43

Just cracked mine open and it matches Sonic VI's schem. Will post pics in a bit.

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Re: Jen (Gretsch Playboy) - Harmon Booster

Postby sinner » 11 Mar 2012, 15:40

Run through it again and seems to be fine.

I've changed trimmer size, added wiring, LED, and corrected pot tapers

Wiring is for NPN. I don't give a damn to source PNP silicons, dealing with PITA powering and stuff. NPN's won't explode :twisted:
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Re: Jen (Gretsch Playboy) - Harmon Booster

Postby sonicvi » 16 Mar 2012, 21:58

The BC318Cs I bought from Mouser were NPN. You want NPN, Not PNP. I didn't worry about gain values. I think the 318s were in the 400-500 range. They're discontinued by Fairchild now. I'm sure anything similar will be fine.

http://www.mouser.com/Search/ProductDet ... 512-BC318C
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Re: Jen (Gretsch Playboy) - Harmon Booster

Postby sonicvi » 16 Mar 2012, 22:02

Looks like Mouser has plenty in stock still.
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Re: Jen (Gretsch Playboy) - Harmon Booster

Postby bandus » 04 May 2012, 16:13

hi guys!

i have a jen harmon booster and i want to know when was it made.

http://timemachinery.tumblr.com/post/16175022301/ive-got-a-jen-made-in-italy-harmon-booster here are some pictures. i heard that they was made from the late 60s. but my frien told me this one made round the 80s. are they made differently or did any circuit modification?

thanks!
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Re: Jen (Gretsch Playboy) - Harmon Booster

Postby sonicvi » 07 May 2012, 20:46

They were made in the late 70's.
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Re: Jen (Gretsch Playboy) - Harmon Booster

Postby azrael » 27 Jul 2012, 04:49

Any idea what kind of voltages are the transistors operating at?
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Re: Jen (Gretsch Playboy) - Harmon Booster

Postby chicago_mike » 27 Jul 2012, 13:11

this sounds so good on bass!!
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Re: Jen (Gretsch Playboy) - Harmon Booster

Postby sinner » 28 Jul 2012, 06:05

chicago_mike wrote:this sounds so good on bass!!



Who's layout did you used? Is that mean mine is confirmed? :)
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Re: Jen (Gretsch Playboy) - Harmon Booster

Postby chicago_mike » 11 Aug 2016, 07:18

Reviving old thread!!

My buddy has one that his dad bought long ago! Sounds amazing on bass and I need to clone this!!
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Re: Jen (Gretsch Playboy) - Harmon Booster

Postby MGaburriJazzDude » 06 Nov 2016, 17:53

I build it with BC549's and a 22K resistor instead of the trimpot; and it sounds AMAZING!
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Re: Jen (Gretsch Playboy) - Harmon Booster

Postby johnk » 25 Dec 2016, 19:32

i love mine too. i used BC318C's in it.
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