(@ Modman, yes! I've read your PM and will give you a call later)
A while ago someone put my attention to a small tweak for an Ibanez DL-5 delay by doubling the delaytime by doubling the RAM. Beautiful in it's simplicity and therefore, without a hurry, something I had to try.... as soon as I could lay my hands on a cheap DL-5. At one point someone had laid his cigarette on top of the pedal leaving a nice burn mark.
That happened a little over a week ago when I BIN-ned myself an affordable one on the German Ebay.
The thing arrived yesterday so, having an appintment later that evening the only thing I could do was get thet screwdriver and give the guts an investigating look.
A DL-5 uses an 4164 DRAM.
In my fresh aquired DL-5 there wasn't a 4164 DRAM.
Huh?
About on the location where it should be was a 74HC04. On my planet that's a hex inverter. Propagation delay is inaudible and cannot be considered "delay" from a musical perspective.
Puzzle was easily solved as the board text said EM-5. That's the Echo Machine and the only soundtank that's considered a little collectible. The echo machine uses clipping and filtering on it's delays to give a tape echo suggestion. In my DL-5 with EM-5 board the clipping diodes and filter cap were left out. No suggestion of a soldering ioron ever touching those joints.
Which leaves the only conclusion that Ibanez manufacturer at some point was either out of DL-5 boards and adapted the EM5 to do the job or at one point the DL-5 was just an alteration of the EM-5 circuit. (read: Cheaper Production). Future investigation will have to point that out.
So, there I was with a "higher value" EM5 in a battered DL-5 case... If it wasn't for the fact that I did a recase job on a mint EM-5 (better pots, TB switching into a 1590B) a few weeks ago and had an empty EM-5 case.
Gutswap!!, and 3 components soldering. D_H has an EM-5 dirt cheap.
Strange happenings with an Ibanez DL-5 [SOLVED]
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Dirk_Hendrik
- Old Solderhand
Information
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analogguru
- Old Solderhand
Information
Secret seems to be different:
The DL5 used a M50195P which production was cancelled by Mitsubishi in the mid-90´s. So they had to find a solution for that.....
The 74 HCU 04 is used as an oszillator = delay time
analogguru
The DL5 used a M50195P which production was cancelled by Mitsubishi in the mid-90´s. So they had to find a solution for that.....
The 74 HCU 04 is used as an oszillator = delay time
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
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Dirk_Hendrik
- Old Solderhand
Information
OK... Would that mean that the M65831AP used in the EM was available at that time? Since this chip does have it's own DRAM that would make sense.analogguru wrote:Secret seems to be different:
The DL5 used a M50195P which production was cancelled by Mitsubishi in the mid-90´s. So they had to find a solution for that.....
I knowanalogguru wrote: The 74 HCU 04 is used as an oszillator = delay time
analogguru
Most likely we're looking at the same schematic. I was more referring from the "I found a 74 logic gate at the location where I expected to find a DRAM" -
analogguru
- Old Solderhand
Information
It´s the follow-up with it´s own S-RAM...OK... Would that mean that the M65831AP used in the EM was available at that time? Since this chip does have it's own DRAM that would make sense.
Here is the datasheet:
http://www.alldatasheet.com/datasheet-p ... 831AP.html
About schematics:
I don´t know, if you know the CD5 (Cyberdrive) schematic....
I am wondering about the "tone-control" section , I can´t believe that this is correct. Did you control that ? or are there gut-shots available ?
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
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Dirk_Hendrik
- Old Solderhand
Information
The cyberdrive, as you know:
http://dirk-hendrik.com//ibanez_cyberdrive.pdf
Makes perfect sense if you place it in the time it was developed. (The moment the Hoshino group was getting away from Maxon but still levarged on the Maxon developments) The drive section most likely is derived from the Fat Cat (which is on itself a dead on clone of the ProCo Rat (but you knew that already
) but with the alteration of having it's clipping diodes in the feedbackloop. It was after that combined with the 2nd version of the WH-10, which I usually refer to as the 'single" pot version since it uses a single pot for the wah center frequency contron whereas the earlier version uses a dual pot which consists of a 500k linear and a 50k "w" or "g" taper. For your reference the WH10 single pot schematic:
http://www.freeinfosociety.com/electron ... hp?id=2293
When using a Cyberdrive you'll find that the tone control indeed acts as a bandfilter, a.k.a. a wah, and therefore goes after Satriani, Micheal Schenker, Santana or Mark Knopfler in "money for nothing" like "wah in fixed position sounds.
OT
ref. the Cyberdrive's tone control.
Dirk, what a neat little "circuit snippet"! Thank you very much for that and the wh-10 reference. I'll cut that tone control part out and post here for guy's to have a future tone control reference.
Nice score on the EM-5. I'm partial to the PT2395 cheapos myself.
ref. the Cyberdrive's tone control.
Dirk, what a neat little "circuit snippet"! Thank you very much for that and the wh-10 reference. I'll cut that tone control part out and post here for guy's to have a future tone control reference.
Nice score on the EM-5. I'm partial to the PT2395 cheapos myself.
Information
Hi,
The 50195 = PT2395 / 65831= PT2396. For 800ms, you can use the HT8955A with DRAM 41256.
regards Uwe
The 50195 = PT2395 / 65831= PT2396. For 800ms, you can use the HT8955A with DRAM 41256.
regards Uwe