Ever seen these resistor values in a TS9?

Started by darbycrash, February 13, 2022, 03:39:17 PM

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darbycrash

Forgive me if this is the wrong section to post this in:

Poking around in a TS9 that, to my ears, sounds really good - I found that the 2 resistors that are often changed in these did not match the usual suspects' values. Unless these older resistors are coded differently, I'm getting 8G ohms :o for the grey-black-grey-gold (or is that white!?) and 80k for the grey-black-orange-gold (again, I guess that could be white but faded but they look grey to me). Has anyone ever seen these particular values in a TS9 before? What would be the benefit from a technical standpoint of using the values, if any? Thanks and again, sorry if this is not in the right forum section.


PRR

#1
8Gig makes no sense. For the application, or for 13-cent resistors. Use a better light.
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Clint Eastwood

These resistors look to me like very old ones, from the fifties. So not original ones I suspect. Maybe the colors faded? did you try measuring the resistance?

idy

Better light, a meter could tell you something.... what part of the circuit are they?
There was a fetish to put carbon comp resistors in certain places. These look like larger wattage than their neighbors, not necessarily antiques, again a fetish.

darbycrash

#4
Quote from: idy on February 13, 2022, 08:29:25 PM
Better light, a meter could tell you something.... what part of the circuit are they?
Quote from: Clint Eastwood on February 13, 2022, 05:01:28 PM
These resistors look to me like very old ones, from the fifties. So not original ones...

Sorry I was not more specific guys! By "usual suspects" in my OP I was referring to the 2 resistors that usually get changed in TS9's to convert them to 808 spec. I believe they are the output resistors, R15 and R13. From what I understand the proper values for the 808 mod would be R15 to 100 ohms and R13 to 10k. I have not had a chance to pop them out and measure them quite yet - was just curious if anyone here had ever seen this before! I will definitely report back when I get a chance to do so. Thanks everyone!  :icon_cool:

idy

If those are the output Rs you do not need to remove them to measure them.

Elektrojänis

It would make a lot of sense if the brown color on those was just bad and faded a lot. Brown color could have a lot of red pigment (brown is actually just dark and dull orange or red)... And that would lead us to suspect that yellow might be faded orange. There... brown-black-brown and brown-black-orange. :) Well... Measure and you will know a lot more.

Clint Eastwood

Quote from: Elektrojänis on February 14, 2022, 02:15:59 AM
It would make a lot of sense if the brown color on those was just bad and faded a lot. Brown color could have a lot of red pigment (brown is actually just dark and dull orange or red)... And that would lead us to suspect that yellow might be faded orange. There... brown-black-brown and brown-black-orange. :) Well... Measure and you will know a lot more.

I support that hypothesis

darbycrash

Quote from: Elektrojänis on February 14, 2022, 02:15:59 AM
It would make a lot of sense if the brown color on those was just bad and faded a lot. Brown color could have a lot of red pigment (brown is actually just dark and dull orange or red)... And that would lead us to suspect that yellow might be faded orange. There... brown-black-brown and brown-black-orange. :) Well... Measure and you will know a lot more.

:icon_cool: Thanx! That makes a lot of sense. Also - I should have known better to consult the oracle without just measuring the damn things....sorry folx  :icon_redface:

Elektrojänis

Quote from: darbycrash on February 15, 2022, 12:10:50 AM
:icon_cool: Thanx! That makes a lot of sense. Also - I should have known better to consult the oracle without just measuring the damn things....sorry folx  :icon_redface:

Interesting puzzle anyways. Remember to report back when you measure. :)

If those are the the series and shunt resistors on the output, I doubt they will make much audible difference to the sound. I'd guess small variations caused by component tolerances in the clipping and tone control stage would make a lot more audible difference. This is only a quess though. I have never built a full tube screamer, and it has been a while since I built the minimal version.