Pages

▼

Tuesday, March 26, 2019

Keeley 1962

Take a Blues Breaker and mash it between two Katana boosts and you have the 1962. Couple minor differences from a typical Blues Breaker beyond that. Trace over on FSB. There are two versions of this circuit, the 1962 and the 1962x. As far as I can tell, the only difference between the two is the clipping. I've added a DPDT toggle to switch between the two versions.


There's also a fabricated version in the store, the LXII.




A couple notes:

When I verified the fab'd version I didn't notice much difference tonally between the two clipping settings, so you may want to either leave it out or experiment with that section. I changed the value of the resistor from 9v to the drain of Q3 from 47k in the trace to 22k. Wouldn't bias properly otherwise. Also for the caps with questions marks in the layout above I used 10nF, except for the yellow cap to the right of the IC, which I used 100pF.
at

24 comments:

  1. estivenMarch 26, 2019 at 10:14 AM

    diodes 4148s reemplacement 4001 maybe sound different!! very good thnks so much!!! EXCELLENT

    ReplyDelete
  2. Diego JorgeMarch 26, 2019 at 11:30 AM

    Two SW1 pads?

    ReplyDelete
  3. UnknownMarch 28, 2019 at 4:59 PM

    Parabéns pelopotimo tebalhtr com os layouts, esteeja está verificanddo?

    ReplyDelete
  4. UnknownMarch 28, 2019 at 5:00 PM

    Parabéns pelo otimo trabalho com os layouts, este ja está verificado?

    ReplyDelete
  5. AnonymousMarch 30, 2019 at 10:48 PM

    Ainda não ... apenas a placa fabricada foi verificada.

    ReplyDelete
  6. bcruzin2April 2, 2019 at 4:43 PM

    Works great, I might mess a little with the tone cap on the top end but this does sound fantastic. Thanks for another great layout!

    ReplyDelete
  7. Ryohei JPNApril 15, 2019 at 11:00 AM

    2N5458 does't work but J201 does. Very mysterious.. Anyway, thank you very much for sharing this one. I like it!

    ReplyDelete
  8. FergJune 4, 2019 at 8:40 AM

    Just finished this one using 2n5457 transistors. Sounds great. I hear a very distinct difference with the clipping switch, well worth including it in my opinion.

    ReplyDelete
  9. wainer.said@gmail.comOctober 22, 2019 at 11:33 PM

    but I get only clear sound, no distortion. What can it be...

    ReplyDelete
  10. jrdnJanuary 8, 2020 at 1:12 AM

    @Effects Layouts, the 100nF electro cap, is that 100nF or did you mean 100uF?

    ReplyDelete
    Replies
    1. Effects LayoutsJanuary 8, 2020 at 9:22 AM

      That should be 100uF

      Delete
    2. jrdnJanuary 8, 2020 at 10:03 AM

      Cool thanks! Hey man, thanks for everything that you're doing here. Happy new year to you and your family.

      Delete
    3. Effects LayoutsJanuary 8, 2020 at 4:34 PM

      Appreciate it! Happy new year!

      Delete
  11. ScottnfldApril 7, 2021 at 5:37 PM

    Anyone built this one yet?

    ReplyDelete
    Replies
    1. Effects LayoutsApril 7, 2021 at 5:43 PM

      Read the comments? ;)

      Delete
    2. ScottnfldApril 8, 2021 at 7:10 PM

      Haha yeah saw those. Tried to click on the link for the store but I guess the LXII is no longer available?

      Delete
    3. Effects LayoutsApril 12, 2021 at 3:03 PM

      The board didn't sell all that well, so I didn't keep it in stock :\

      Delete
  12. UnknownSeptember 29, 2021 at 6:37 AM

    Hi! I've just built it last night, but had no success in getting it to work right. As I didn't have the 2n5458, I used 2sk117, and I guess it's mostly why it's not working correctly - sounds very fuzzy and the signal is oscillating a bit. Perhaps it's something to do with biasing, but I'm not very confident with how to approach it. Also, I found this other layout on vero, and it ahs different components, such as additional diode, a 100uF cap... http://dirtboxlayouts.blogspot.com/2019/09/keeley-19621962x.html so I'm wondering which one's more precise... Any note you may share will be appreciated, thanks!

    ReplyDelete
    Replies
    1. Effects LayoutsSeptember 30, 2021 at 4:50 PM

      I went through and compared the two layout and aside from Fuzzhead simplifying some resistor values, I didn't see anything different. I think the 2SK117 has a different pinout than the 2N5458, so double check that. I could just be that the JFETs you used need to be biased differently than the original ones. You'll need to adjust the values of the resistors going from voltage to the collectors.

      Delete
    2. razrookOctober 1, 2021 at 5:54 PM

      This comment has been removed by the author.

      Delete
    3. UnknownOctober 1, 2021 at 6:48 PM

      Thanks! Yup, I had to make adjustments considering those pinouts, plus I didn't catch it in the comments that the 100nF cap should be 100uF - that's why all crackling fuzz was happening and that was what confused me about the Fuzzhead'layut, plus he used 1n5817 diode... Anyway, it's a good one (a bit grittier than I imagined), and thanks for everything you're doing/done here - it's a place of wonders!

      Delete
  13. razrookSeptember 30, 2021 at 4:06 PM

    Mine seems indifferent to removing the red diode or the 2n7000 transistor, although there is a difference between the switch positions... Checked all the paths - I'm clueless...

    ReplyDelete