Dotcomformat

ARP specified the 2N5249 as an alternate for the TZ81. They likewise 
specified 2N5367 as an alternate for the TZ581

2N3904 would be a modern sub for the TZ81, and 2N3906  for the TZ581.

I have some ARP stuff on my website 
(http://www.guitarfool.com/ARP2500.html), including the original 1006 which 
was slightly diferent from the 4012 & 4035.

ARP had other filters, like the 4023 and the 4072 & 4075, which sound a bit 
diferent from the ladder.

Jeff

----- Original Message ----- 
From: "Larry T." <larry@unicode.com>
To: <dotcomformat@yahoogroups.com>
Sent: Thursday, December 15, 2005 6:50 PM
Subject: [dotcomformat] Re: ARP Filter vs. Dotcom Filter


> --- In dotcomformat@yahoogroups.com, "Dana Countryman" <dana@d...> wrote:
> <snip>
>> Has anyone here tried to build the ARP filter?:
>> http://www.arptech.synth.net/pdf/4012.pdf
>>
>> I guess my questions are:
>>
>> 1) Has anyone done a side by side comparison of the Arp filter vs.
>> the Dotcom Filter...?
>>
>> 2) Would it worthwhile to have this filter?
>>
>> and
>>
>> 3) Can one still get the semiconductors needed for this circuit?
>>
>> I'm always looking for a new sound that I can't get currently...
>>
>>  - Dana
>>
>
> Dana, I can't address #1 or #2.  However, I did some searching for the
> TZ-81 transistors and the AD3958 dual FET.  No such beasts available.
> In fact, I can't even find data sheets for them!  It is entirely
> possible that the 'TZ-81' is an internal ARP designation for some
> otherwise standard transistor, but since I'm not an ARP tech, I don't
> know.  I suspect that buiding this particular filter would prove VERY
> difficult.  Given the number of filters currently available from other
> sources, I'd stick to getting current releases and re-formatting them
> (like you are doing with the Blacet).
>
> I'm curious if anyone has tried any of the Club-Of-The-Knobs filters
> to see how they compare to the DotCom/Moog?  What about re-formatting
> of Doepfer/Analogue Solutions/... EuroRack modules?
>
> Larry T.
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> Yahoo! Groups Links
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