That pot really change how the amp sounded and felt for the better. The cleans have a really nice bell tone on the high end and the overdrive is way more focused and well, Dumble sounding. The pot measured 255k and I know the taper is different but even with the treble control turned down, the amp sounds way better. Now for the 1m volume controls... Smile
Charlie
Types of pots/Resistors/ Caps/Seasoned Iron/cables/Layout dress...All (signal path) will make an audible difference..DON"T ask me why? although you have noticed what I have (and some others here) have been shouting for years..This is IMO a big part of the genius that is HAD.."Parts Selection"..Most of the engineer types who build want proof as to how and why some of these components effects frequency response?..To me it's quite simple really.. Use the SAME! parts he used and well!!
Dumble sounding
IMO..The 1M Vol/Drive/OD Level/Master/ well also get you closer..
I just found it interesting that #123 and #124 both had higher value trimmers and both were for Stratocaster
Simple!!..To help fatten up the single coils..
BTW..OD Drive/Level/Trimmer values are a great place to tweak!!
Tony
" The psychics on my bench is the same as Dumble'"
Tony, You know a friend of Alexander told me that he likes to put at least one part from Radio Shack in his amps. I think he does it out of nostalgia from the days when a kid could go in there and get a cool kit to build or just look at all the components. The thing is Dumble back in the day could have made a phone call to CTS and order enough pots of the same spec as Fender to last him a lifetime but he used Fender parts instead. I also don't know if he used seasoned iron for sonic reasons or because Fender probably would not sell him the Transformers new. The other thing is that as the decades went by his component choices seem to change with what was available to him. Q-lines to NTE metal film, Sprague capacitors to NTE capacitors, Fender transformers to Magic Parts to Mercury Magnetics. I am not saying the guy isn't a genius, I just think he is also practical. I bet Steve's Tweedle Dee with all those NOS parts sounds better than the original.
Charlie
Types of pots/Resistors/ Caps/Seasoned Iron/cables/Layout dress...All (signal path) will make an audible difference..DON"T ask me why? although you have noticed what I have (and some others here) have been shouting for years..This is IMO a big part of the genius that is HAD.."Parts Selection"..Most of the engineer types who build want proof as to how and why some of these components effects frequency response?..To me it's quite simple really.. Use the SAME! parts he used......
Tony
Tony the way I see it, the less believers the more parts for me to round up....LOL
talbany wrote:My post was to "simply" imply that not all "Low Plate Classics" had the higher value 345K (scratched 500k) as in 124 and 123.
I see. IMO there's of course the possibilty, that the "500K" trigger found in #0124 has been installed when it was updated to skyline specs. But of course there's the possibility, too, that it was in this amp before the update. AFAIR the date code on this 500K trimmer in #0124 backs up both possibilities.
AFAIR it's correct, that #0123 has been built for a strat player (AFAIR: 1956 maple neck). But AFAIR #0123 isn't what's called a "low plate classic" here, but what's called a "high plate classic" here.
@Jelle: IMO your measurement of this 100K trigger (72K) is in best accord with my statement, that we know for sure, that (at least!) not all the original "low plate classic" ODS amps have installed what talbany called a "larger value trimmer".
talbany wrote:My post was to "simply" imply that not all "Low Plate Classics" had the higher value 345K (scratched 500k) as in 124 and 123.
I see. IMO there's of course the possibilty, that the "500K" trigger found in #0124 has been installed when it was updated to skyline specs. But of course there's the possibility, too, that it was in this amp before the update. AFAIR the date code on this 500K trimmer in #0124 backs up both possibilities.
AFAIR it's correct, that #0123 has been built for a strat player (AFAIR: 1956 maple neck). But AFAIR #0123 isn't what's called a "low plate classic" here, but what's called a "high plate classic" here.
@Jelle: IMO your measurement of this 100K trigger (72K) is in best accord with my statement, that we know for sure, that (at least!) not all the original "low plate classic" ODS amps have installed what talbany called a "larger value trimmer".
Cheers,
Max
Here is a question for you?
Since both 124 and 123 have the same (high value) trimmer and were only 1 ser # apart..Would it be possible that both amps were built for the same client that requested the so called Strat voicing?.. Perhaps 124 was also a High Plate Classic in it's original form and later converted to a low plate at the time of the Skyline update..Since Gil was in 124 maybe he can comment on if there were any clues as to if the plates/Cathode and bypass caps were changed as well..
Throwing the speculation hook in the water,,
Tony
" The psychics on my bench is the same as Dumble'"
talbany wrote:Here is a question for you? Since both 124 and 123 have the same (high value) trimmer and were only 1 ser # apart. Would it be possible that both amps were built for the same client that requested the so called Strat voicing?.
AFAIK: No - not possible. Let me explain:
AFAIK the original owner of #0123 did indeed order two ODS (both with an "export" PT), two Dumbleators, and two 2x12" cabinets. But AFAIK his second amp wasn't #0124 but the one on the attached pictures. Picture source: http://www.gbase.com/gear/dumble-overdr ... -2x12-1984#
talbany wrote: Perhaps 124 was also a High Plate Classic in it's original form and later converted to a low plate at the time of the Skyline update.
Might be possible. Perhaps you can find out by looking again at the #124 pictures: The goop used after the update has a different color than the goop used before the update. So you could perhaps try to identify what kind of goop is on the "low plate parts": both - or only the second kind of goop applied after the skyline update.
AFAIR the original owner of #0123 requested two amps with clean channels staying completely "clean" at large volumes, too. And AFAIR that's exactly what the clean channel of #0123 does. Nice (IMO) OD, too, with AFAIR "flutelike" (in my perception) OD harmonics.
Cheers,
Max
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AFAIK the original owner of #0123 did indeed order two ODS (both with an "export" PT), two Dumbleators, and two 2x12" cabinets. But AFAIK his second amp wasn't #0124 but the one on the attached pictures. Picture source: http://www.gbase.com/gear/dumble-overdr ... -2x12-1984#
Oh That's right now I remember 0123 and it's sister amp..Didn't 1 go to Japan and the other Bruce's (Music Exchange) Baltimore..Thanks for the reminder..I do remember 0123 being a wonderful sounding amp!!
I thought I remember a post where Gil thought the bypass caps might have been changed in 124.. I'll take a look at the pics again..
All The Best!
Tony
" The psychics on my bench is the same as Dumble'"
Hello, on the subject of modified trimmers. How does one take a large value trimmer and make it smaller by modifying it? I always thought that if you scrape the trace on a trimmer you increase its value.
CW
Charlie Wilson wrote:Hello, on the subject of modified trimmers. How does one take a large value trimmer and make it smaller by modifying it? I always thought that if you scrape the trace on a trimmer you increase its value.
CW
scraping takes AWAY material ( less distance between poles) and LOWERS resistance, so ADDING material INCREASES resistance,,,,got me too first time, n i went to school in electronics lololo! U can fix ANY std pot like this! ALL of those CTS open bodies are OFF...now u don`t have ta throw them away, i was told HAD threw away pots outa whack, non sense!
Charlie Wilson wrote:Hello, on the subject of modified trimmers. How does one take a large value trimmer and make it smaller by modifying it? I always thought that if you scrape the trace on a trimmer you increase its value.
CW
scraping takes AWAY material ( less distance between poles) and LOWERS resistance, so ADDING material INCREASES resistance,,,,got me too first time, n i went to school in electronics lololo! U can fix ANY std pot like this! ALL of those CTS open bodies are OFF...now u don`t have ta throw them away, i was told HAD threw away pots outa whack, non sense!
Removing material from the resistive trace increases the resistance from one end to the other. Imagine the trace as a large number of parallel resistors and this will be clear.
Re the 500k trimmer that measures 345k, it is possible that the case from a 500k part was combined with the element from say a 250k part, which had been scraped "up" to 345k.
martin manning wrote:Removing material from the resistive trace increases the resistance from one end to the other. Imagine the trace as a large number of parallel resistors and this will be clear.
Re the 500k trimmer that measures 345k, it is possible that the case from a 500k part was combined with the element from say a 250k part, which had been scraped "up" to 345k.
