Search found 6 matches

by knottypine
29 Sep 2019, 00:34
Forum: Boutique Stompboxes dissected...
Topic: Benson Preamp [traced]
Replies: 89
Views: 24805

Re: Benson Preamp [traced]

Is there a suggested voltage for Q1? Pedal sounds pretty nice in front of my Music Man with Bass, Mid, and Treble set to 5 ~5V, or if you have a bunch of J201, set the source resistance to 12K and swap JFETs until you get one sit at 5V at the source. This will achieve a closer sonic result than jus...
by knottypine
07 Sep 2019, 02:43
Forum: Boutique Stompboxes dissected...
Topic: Benson Preamp [traced]
Replies: 89
Views: 24805

Re: Benson Preamp [traced]

Is there a suggested voltage for Q1?

Pedal sounds pretty nice in front of my Music Man with Bass, Mid, and Treble set to 5
by knottypine
07 Sep 2019, 02:39
Forum: Boutique Stompboxes dissected...
Topic: Benson Preamp [traced]
Replies: 89
Views: 24805

Re: Benson Preamp [traced]

Reverse your lug 1 and 3 connections on your pot, and the jumpers if you installed them.
- I did exactly this and the sweep functions as it should. Thank you.
by knottypine
05 Sep 2019, 01:48
Forum: Boutique Stompboxes dissected...
Topic: Benson Preamp [traced]
Replies: 89
Views: 24805

Re: Benson Preamp [traced]

Hi Knttypine, Does it still squeal when the drive is turned up beyond 12 O'clock? Pedal PCB has leg 3 of the treble pot connected to the 22nF cap, 2 to ground and 1 not connected, is this how you had yours wired up? I got it to stop squealing once I used the right value on the 250pf and 470pf caps....
by knottypine
04 Sep 2019, 01:24
Forum: Boutique Stompboxes dissected...
Topic: Benson Preamp [traced]
Replies: 89
Views: 24805

Re: Benson Preamp [traced]

Checking in! Switched Bass from 1M to 2M Just replaced the 2N5457’s with J201’s Q3 & Q2 are biased at 4v Q1 measured at 6v Also I had to rearrange the legs on the on the J201 to DSG (not DGS) to get Output. So I am not sure if the pin out on the strip board layout is correct Overall more usable gain...
by knottypine
20 Aug 2019, 04:04
Forum: Boutique Stompboxes dissected...
Topic: Benson Preamp [traced]
Replies: 89
Views: 24805

Re: Benson Preamp [traced]

Because I am a bit impatient I went ahead and wired one up with what I had so buckle up... I didn’t have a: 250pf so I used a 300pf 470pf so I used a 680pf J201 so I used 2N5457 (Q2 & Q3 biased at 4V) 2M so I used a 1M for the bass pot What I’ve observed is.... Decent output volume Very subtle (if a...