Hornby (Skewes, JHS) Selectatone T.B.2 (Treble/Bass Booster)

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Hornby (Skewes, JHS) Selectatone T.B.2 (Treble/Bass Booster)

Postby Electric Warrior » 02 May 2011, 17:24

Gut shots can be found here: http://www.solidbodyguitar.com/Hornby.htm

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Drzeus (02 May 2011, 20:46), flatcrabs (02 May 2011, 17:57), stomper (31 Jul 2011, 15:51), vot (11 May 2011, 02:42), WeAre138 (03 May 2011, 02:24)
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Postby Drzeus » 02 May 2011, 20:52

I can play the aqualung lick,and some great shots EW! As the main JHS guy,are you going to be doing a schematic in the future? Thanks
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Re: Hornby (Skewes, JHS) Selectatone T.B.2 (Treble/Bass Boos

Postby Electric Warrior » 02 May 2011, 21:49

I'll give it a shot but many details can't be seen in the pics..
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Re: Hornby (Skewes, JHS) Selectatone T.B.2 (Treble/Bass Boos

Postby Electric Warrior » 02 May 2011, 23:05

Here's how I see it:

selectatone.png


any objections?
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Re: Hornby (Skewes, JHS) Selectatone T.B.2 (Treble/Bass Boos

Postby Electric Warrior » 03 May 2011, 00:42

a bit neater:

selectatone.png


The resistor in the bass section must be 1k of course (like in the Hornby Skewes Bass Booster). I can make out the red band clearly and the other two are dark.

I believe the two missing capacitors are most likely 0.1µFs (right - like the Bass Boost :mrgreen: ). We can be pretty sure about the one on the collector. The Treble Booster has 0.001µF there. 0.1 and 0.001µF in series isn't that much lower than 0.001µF.
The input cap might be more debateable..
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Postby Drzeus » 03 May 2011, 00:46

Not from me EW!.I'll knock one up,see how it flys?.You're a star!
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Re: Hornby (Skewes, JHS) Selectatone T.B.2 (Treble/Bass Boos

Postby Electric Warrior » 03 May 2011, 00:53

Well, it's just a Hornby Skewes Booster with switchable output section. :D

The bias resistors are different from the silicon version of course, but we already knew that from the germanium Treble Booster pic. The value that's new here is the the 100k from base to -9V. That one wasn't visible in the other pic.

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Postby Drzeus » 03 May 2011, 03:20

That's the beauty EW.I've built a silicon booster with a 4061 in,and a switch for the debated input caps,but never a GE version.It's like you've given me a jigsaw piece i had missing!
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Postby Drzeus » 07 May 2011, 20:31

Is the 1k/0.1uf to ground,seperate to the treple switch,or joined to the 100k to ground?
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Re: Hornby (Skewes, JHS) Selectatone T.B.2 (Treble/Bass Boos

Postby Electric Warrior » 07 May 2011, 20:41

good question.. it's hard wired to ground.. but the 10k/1k joint and the 0.001 probably aren't.. I'll update my schematic..
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Re: Hornby (Skewes, JHS) Selectatone T.B.2 (Treble/Bass Boos

Postby Electric Warrior » 07 May 2011, 20:48

here you go:

selectatone.png


what a stupid mistake.. :mrgreen:

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Postby Drzeus » 07 May 2011, 21:20

Not a mistake,an update.Thanks EW
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Re: Hornby (Skewes, JHS) Selectatone T.B.2 (Treble/Bass Boos

Postby Electric Warrior » 07 May 2011, 21:27

your post subjects are funny :mrgreen:
Aldi?
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Postby Drzeus » 08 May 2011, 18:25

Aldi number 1 dude!The quality of german sausage and other meats,also dutch like frikandellan,are much preferable to the mechanically seperated twine and cereal we get from sainsburys.Cheaper too.DPDT on the output network?
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Re: Hornby (Skewes, JHS) Selectatone T.B.2 (Treble/Bass Boos

Postby Electric Warrior » 08 May 2011, 19:17

Funny how cheap Frikadellen are the one thing I wouldn't buy from Aldi :D

DPDT indeed :thumbsup
They used DPDT switches for on/off on the seperate Treble and Bass boosters, too, but didn't wire them up for true bypass.. same deal with the Rangemaster. Disconnecting the battery took priority...
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Postby Drzeus » 09 May 2011, 18:13

I lived in amsterdam an zwolle for a few years,and got a thing for those glass holders,u put a few guilders in an took a frikandelllan,them went in to get some frite saus
lekkerer!
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Re: Hornby (Skewes, JHS) Selectatone T.B.2 (Treble/Bass Boos

Postby RnFR » 09 May 2011, 18:40

I think I spent 100 bucks in those things in 3 days. :lol:

nice work on this one. I'm gonna mark it solved. :thumbsup
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Re: Hornby (Skewes, JHS) Selectatone T.B.2 (Treble/Bass Boos

Postby Electric Warrior » 09 May 2011, 19:21

well, nearly.. anybody know the guys at solidbodyguitar?
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Postby Drzeus » 10 May 2011, 02:33

It'd be good to get the worked up schematic to them?
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Postby Drzeus » 10 May 2011, 03:02

Sorry 'bout this.My edit function seems to go after a minute?.So EW,the cap off the collector but before the t/b network,is 0.1uf to your mind?.And the input cap the same?.Thanks again mr.jhs!
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