I picked up a Taiwan DS-1 with the Tosiba op-amp last night for $59 shipped. Figure it might be cool to try that next to the one I Keely modded to see how it compares. As I understand it the guts are the same as the Japanese ones? Looked like it from the Ebay pictures.
I've got one of the early MIT ones and, AFAIK, they are the same as the MIJ ones.
BossArea wrote:The design of the DS-1 has changed little throughout its lifetime but the opamp the circuit is based around has changed several times. From 1978, the DS-1 was using the Toshiba TA7136AP opamp. This remained unchanged for about 16 years but in 1994 it was replaced by the Rohm BA728N. In 2000 the opamp was again changed. This time the Mitsubishi M5223AL was used. The last change came 2006 when the New Japan Radio NJM2904L opamp was introduced.
The DS-1 went through a few cosmetical changes in the early years of production. The first version had a clear switch, silver thumb screw and the D in DS-1 placed directly underneat the t in Distortion. This is usually referred to as the long dash version. The clear switch disappeared around serial number 8700, the silver thumb screw at serial number 0500 while the D in DS-1 ended up under the i in Distortion around serial number 14xx00 (short dash version). Since early 1982 the only changes has been to the bottom label. It changed when the production moved from Japan to Taiwan i 1988 and a silver label was introduced when the circuit was modified to accept the PSA adapter 1994.
Don't know (I'm clueless about this sort of thing but just knew daisychaining them with PSA pedals worked).
Does this help:
BossArea wrote:The ACA is an unregulated 9V or 12V adapter. For a long time both the ACA and the regulated PSA adapter was available but in the later part of the 90s the ACA adapter was discontinued as all Boss pedals then was designed to run with the PSA adapter.
When a power supply is unregulated, it means that the voltage level will drop as the load is increased. The ACA adapter may give out a full 12 volt when it is powering one or two pedals but if it is hooked up to a long row of pedals the voltage will drop. The ACA adapter is capable of supplying as much current as 250mA but problems keeping the voltage up may occur before the load reaches that level.
The early compact pedals was designed to run on either a 9V DC battery or 12V DC adapter. Because of this the ACA adapter was a 12V adapter. The voltage was reduced to 9V internally by using a 470 Ohm resistor and 1S2473 diode between the minus input on the power jack and ground. The resistor diode pair was later removed and at the same time the ACA adpater was redesigned to output 9V instead.
Powering ACA pedals with a PSA power supply
Powering the older pedals designed for 12V DC input with either a newer ACA or PSA adapter will not work very well. The voltage drop over the resistor and diode will prevent the pedal from getting enough power and its LED will usually only glow faintly. The solution is to use a daisy chain and plug in another pedal designed for the newer ACA or PSA adapter. The lead between the two pedals will short the resistor diode pair and the pedal will receive full power.
Depending on the mains voltage there are 4 were versions of the ACA adapter. ACA-100, ACA-120, ACA-220 and ACA-240. The number denotes the mains voltage that the adpapter should be plugged into. The 9V version of the ACA adapter has a G appended at the end of its name. Pictured is the ACA-120G which is the version sold in the USA.
Fran wrote:I love how this place is basic as fuck.
ekwatts wrote:I'm just going to smash it in with a hammer and hope it works. Tone is all in the fingers anyway.
I don't think it will, if its an unregulated 9v(meaning most likely MORE than 9v like the old ACA boss adaptors) then it will, but I think those are just 9v output. I know my HM-2 is super picky about this, as well as my CE-2, I have them daisy-chained off of my TU-2 pedal.
Hmmm will be interesting to give it a go. My one spot is a long daisy chain anyways so as long as it goes after my Boss Tuner it sounds like it will be ok? (Which I put first in my line anyways for tuning. )
HNB wrote:Hmmm will be interesting to give it a go. My one spot is a long daisy chain anyways so as long as it goes after my Boss Tuner it sounds like it will be ok? (Which I put first in my line anyways for tuning. )
I am not fully qualified to answer this, I believe it should work something about a diode that is disengaged when its daisy chained. You can ask here: http://www.stompboxzone.com/forum/
its a great spot for all Boss information, these guys know what they're talking about and I've learned a ton there.
Got it today and played with it for a super short amount of time, but here are impressions on it vs my Keely one.
This one isn't as loud as the Keely one, but it is more clear at similar settings. The Keely DS-1 has a thicker and more bassy/muffled sound to me. This one is more clear and bright. Both are good but both are different.
It also worked with my One Spot adaptor chained or without chain fine. I did check the guts and it is as pictured above. Same guts as a Japanese one as far as I can tell.
Maybe just rebelling against the Kurt connection? Like Billy Corgan ditching Mustangs because of being compared to Kurt I think I hear? Seems dumb to me. If you like a piece of gear, who cares who else uses it? (My opinion anyways.)
HNB wrote:Maybe just rebelling against the Kurt connection? Like Billy Corgan ditching Mustangs because of being compared to Kurt I think I hear? Seems dumb to me. If you like a piece of gear, who cares who else uses it? (My opinion anyways.)
Exactly, and Kurt didn't care or probably know that most of the Hair bands he was knocking into obscurity used the very same pedal
)
