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Author Topic: Overtone tweeks for the electronically challenged  (Read 5818 times)
jake
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« on: April 25, 2008, 10:43:24 PM »




I probably know just enough to get myself into trouble but you have to start somewhere. I've decided to take the plunge and try tweeking my amp myself. I keep reading posts that give componets but never the exact componets, as in 330pf snubber caps, ok but what voltage? Or, 220K resistor but not what wattage. Little by little over several days I've learned the 330pf caps are 500V and the 220K resistors are 1/2 watt. Thank you to the guys who shared that, I sure as heck would have never figgured it out any other way.

The point of my thread, if anyone would like to chime in to help the beginners here please share the values (all of them too) of the componets you have been tweeking the amp with. Part numbers would be a God send here as well.

I finally was able to find the parts I needed on Mouser (after several attemps).


Mouser #:   581-5KQ331JOCAM
Mfr. #:   
Desc.:   Ceramic Disc Capacitors 500volt 330pF 5% SL

Mouser #:   660-CF1/2CT52R224J
Mfr. #:   CF1/2CT52R224J
Desc.:   1/2Watt Axial Leaded Carbon Film Resistors 220K ohm 5%
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jzucker
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« Reply #1 on: April 28, 2008, 02:49:00 AM »
Here's my list of parts:

 1    313-1210F-100K
Linear D-Shaft 100K    04/24/08    1    2.160    2.16
2    140-XAL350V47-RC
350V 47uF 20%    04/24/08    2    2.650    5.30
3    588-45F470E
5watts 470OHMS 1%    04/24/08    4    1.230    4.92
4    71-CW2B-3.3K
3watts 3.3Kohms 5%    04/24/08    3    0.760    2.28
5    75-516D475M063-E3
4.7uF 63volts 20%    04/24/08    10    0.270    2.70
6    598-CD16FD331JO3F
330pF 500V +/-5%    04/24/08    8    1.630    13.04
7    598-CD15FD391JO3F
390pF 500V +/-5%    04/24/08    2    1.310    2.62
8    81-ERB32QC2H121JDX1L
1210 120pF 500volts    04/24/08    3    0.900    2.70
9    660-MF1/2LLT52R222J
2.2Kohms 5%    04/24/08    10    0.070    0.70
10    71-RL20S-G-3.3K
1/2WATT 3.3KOHMS 2%    04/24/08    10    0.230    2.30
11    660-CF1/2CT52R154J
150K ohm 5%    05/01/08    10    0.100    1.00
12    71-CMF60150K00FHEK
1/2watt 150Kohms 1%    04/24/08    10    0.180    1.80
13    71-RL20S-G-220K
1/2WATT 220KOHMS 2%    04/24/08    10    0.230    2.30

    581-5KQ331JOCAM
500volt 330pF 5%    04/24/08    5    0.250    1.25
2    581-5MQ391KOBAM
500volt 390pF 10%    04/24/08    5    0.240    1.20
3    660-CF1/2C184J
180Kohms 5%    04/24/08    10    0.050    0.50
4    660-CF1/2C154J
150Kohms 5%    04/24/08    10    0.050    0.50
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Mondoslug
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« Reply #2 on: April 28, 2008, 03:03:24 AM »
There ya go.

Hey Jack I forgot to tell you....

#8.)Should be 120 ceramic caps for the bright switch?

They're not ceramic caps that came if that's what they're supposed to be...some other little micro thingies shoed up. I don't think that's what was intended but I've been wrong before.
« Last Edit: April 28, 2008, 03:11:28 AM by Mondoslug » Logged
jake
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« Reply #3 on: April 28, 2008, 11:35:27 AM »
Thanks guys!
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kenster
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« Reply #4 on: April 28, 2008, 01:57:22 PM »
Hey there...
I'm new around here but have been lurking for a couple of weeks. I was fortunate enough to win an OverTone Special on eBay recently. I emailed Nik - what a great guy, indeed - and he sent me this list of mods, most of which I'm sure have come from suggestions here on this board. While Nik was gracious enough to offer these up, he hasn't said what each change does. I'd like to know what to expect from each mod. I may decide it's not one I'd like to make. Can you guys pass that info along?

From Nik's email:
a) Change bright cap from 330pf to 120pf
 
b) Change snubbers on v2 from 270pf to 390pf
 
c) Get rid of the 15 pf cap on MV
 
d) get rid of cap and resistor network on the effects loop jack
 
e) Change the 1uf and 2,2uf cathode preamp caps to both 4.7uf.
 
f) Change the cap on mid boost (deep) switch to 390pf
 
g) See my latest layout. The level pot is now 100K. And the resistor near the OD trimmer is now 220K instead of 150K

Thanks in advance for the helps!
Cheers -
Ken
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Steven_nl
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« Reply #5 on: April 28, 2008, 02:26:31 PM »
don't forget the "change the speaker" tweak  Grin
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jzucker
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« Reply #6 on: April 28, 2008, 10:38:53 PM »
There's more. I'll post after doing my next set of mods.
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