Astrotone Fuzz  [schematic]

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

Re: Astrotone Fuzz

Postby Nocentelli » 17 Jul 2012, 23:46

Seiche wrote:I merely deleted it from the first post and reposted in a new post, that you should be able to do as well with the attachment feature you described.
I could've switched it out in the original post, though.


reading on a blackberry... thought you'd edited the original post :slap:

Seiche wrote:What do you mean by "when you're allowed"? Neighbours? Because I sure as hell ain't gonna stop you! :blackeye


kids and mrs nocentelli in bed. I tried it through headphones just now, though, and it sounds pretty cool! only very quiet strumming, since i play a semi acoustic and 'er indoors is convinced even that will wake the kids up...
mmolteratx wrote:absolutely zero commercial use allowed. If I find anyone selling these, I'll fly to your house and kick you in the nads. And you may or may not find yourself in trouble.
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Re: Astrotone Fuzz

Postby Nocentelli » 18 Jul 2012, 22:53

I've had a bit of a play with it through an amp, and I must say I quite like it. The tone control is quite useful, though I set it around the middle and left it there: Also, I wired mine reversed from seiche's vero (i.e. lug 3 from the output cap , with 1+2 linked and connected to ground) so it gets bassy when anticlockwise, and progressively thinner as you turn it up. I think I'll add a small resistor from fuzz pot lug 1 to ground (10k), so it doesn't mute the signal at minimum fuzz. The clean-up with the guitar volume is so good I'm actually tempted to leave out the fuzz pot altogether. However, this circuit is afflicted with the same issue that plagues the fuzzface: i.e. a buffer in front of the fuzz renders the sound extra gain-y, and robs it of the ability to clean up properly.

Overall, nice fuzz, I'll definitely build one,
mmolteratx wrote:absolutely zero commercial use allowed. If I find anyone selling these, I'll fly to your house and kick you in the nads. And you may or may not find yourself in trouble.
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Re: Astrotone Fuzz

Postby Seiche » 19 Jul 2012, 05:49

sounds good! now I'm tempted to build one too!

Nocentelli wrote:Also, I wired mine reversed from seiche's vero (i.e. lug 3 from the output cap , with 1+2 linked and connected to ground) so it gets bassy when anticlockwise, and progressively thinner as you turn it up.

cheers, I tend to get these wrong, I had a look at analogman's site and you're right, that's how it's supposed to work:
Analogman's Site wrote: The problem with the original design was that there was very little low end, the sound was quite thin. (...) But we made sure that we could still get the EXACT sounds of the original pedal if that was desired. By turning the tone knob up higher, you can still get the original sounds which are good into a large, cranked amp.


I also found a little mistake with the second 47nf cap that was going to the wrong row. I corrected the vero layout on the last page.
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Re: Astrotone Fuzz

Postby Nocentelli » 19 Jul 2012, 06:32

Great, I'll probably build it this weekend. Incidentaslly, I'd be tempted to put a 100uF electro across +9v and ground, but you've left a perfect spot for that down at the bottom left of the vero.
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Re: Astrotone Fuzz

Postby DougH » 20 Jul 2012, 02:11

FWIW: http://www.aronnelson.com/gallery/main.php/v/DougH/fuzz/AstroTone

IMO the stock tone circuit was useless, YMMV. It's still kind of a cheez-whiz fuzz IMO but something for the man who has everything I s'pose.
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Re: Astrotone Fuzz

Postby Seiche » 21 Jul 2012, 02:42

DougH wrote:IMO the stock tone circuit was useless

original version, or analogman's?
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Re: Astrotone Fuzz

Postby culturejam » 27 Jul 2012, 00:54

I did up a layout for etching:
viewtopic.php?f=13&t=18564
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Re: Astrotone Fuzz

Postby allesz » 27 Jul 2012, 15:36

This circuit looks interesting and I plan to breadboard it sooner or later.
Looking at the schematic I have one question (maybe a stupid one): will the circuit work if I remove the 47nF cap after the diode clippers?

This circuit looks somewhat similar to the infuzze I posted in the ready to build effect tread: life is hard for the real innovators :D .
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Re: Astrotone Fuzz

Postby DougH » 30 Jul 2012, 16:20

Seiche, it's the original tone circuit I was referring to.
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Re: Astrotone Fuzz

Postby LucifersTrip » 31 Jul 2012, 21:28

DougH wrote:Seiche, it's the original tone circuit I was referring to.


Isn't the only difference, the 470 instead of 1.8K? It's just a cutoff resistor. You basically have a 10K (with cutoff) across another 10K.

so, original would give you a 5.4K (11.8K //10K) to 1.5K (1.8K //10K) sweep (of the vol pot) and the modded ver would give you a 5.1K (10.47K //10K) to .45K (.47K //10K) sweep...so, I think the only difference, should be that the modded ver let's you get some more treble since the small the vol pot, the thinner the sound.

I forgot what I wound up with in my build...I'll pull out my old notes & check...
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Re: Astrotone Fuzz

Postby okgb » 02 Aug 2012, 12:46

I built it and felt it was a little thin but I got more mileage increasing the in / out coupling caps
than the tone control mod , although I did both , Satisfied now , you can use it with the bridge p/u
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Re: Astrotone Fuzz

Postby LucifersTrip » 24 Aug 2012, 20:46

for someone's gallery somewhere....

a super rare 1967 version with output cable is currently on eBay...for $3000+


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Re: Astrotone Fuzz

Postby LucifersTrip » 24 Aug 2012, 20:48

Image

For this message the author LucifersTrip has received thanks:
Seiche (25 Aug 2012, 11:31)
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Re: Astrotone Fuzz

Postby LucifersTrip » 24 Aug 2012, 21:13

ps:

as analogguru pointed out earlier...this does show the 3.3K resistor (not in schematics in this thread?), the 1.2M and ceramic caps...
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Re: Astrotone Fuzz

Postby LucifersTrip » 24 Aug 2012, 23:22

damn..can't edit...

I meant 3.3M above
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Re: Astrotone Fuzz

Postby mat033 » 28 Aug 2012, 13:49

Hi everyone!

I've done a layout for AM's Astrotone so I thought I'd share it with you. I know Seiche has already done one but as a beginner I wanted to come up with my own.
Mostly, I'd like to know what you think I could improve. :block:

Since the tone control seems to be useless, I replaced it with a fixed resistor (4.7k). I also added a protection diode and a filter cap.
The layout is 12x9 but I will probably need to stretch the lower part a bit since my caps are quite big!
It doesn't have any jumpers or trace cuts but it has 2 stand-up resistors. Is there any reason why I should avoid them -- aside from aesthetics?

Any feedback is very much appreciated! :thumbsup

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Re: Astrotone Fuzz

Postby mat033 » 29 Aug 2012, 12:17

Oops, the electrolytic cap was the wrong way around. :oops:
Here is the fixed version.
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Re: Astrotone Fuzz

Postby LucifersTrip » 05 Sep 2012, 02:05

forgot to post the slightly altered schematic (early specs, 1967) along with my voltages (with fresh 9.6v supply) after I got it to sound cool. I have no idea what the original dome style transistors or the diodes are...
http://www.luciferstrip.com/fuzz/astrotone-guts.jpg

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Re: Astrotone Fuzz

Postby Ghandi » 17 Sep 2012, 22:19

LucifersTrip wrote:Image


...the diodes look like germanium to me!?!
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Re: Astrotone Fuzz

Postby LucifersTrip » 17 Sep 2012, 23:22

Ghandi wrote:
...the diodes look like germanium to me!?!


I guess it's possible, but all versions so far, I believe had silicon....and I have tons of glass silicon diodes that look like those.
If someone can make out a color code, that'd solve it.
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