mitsos
Well-known member
- Joined
- May 4, 2007
- Messages
- 2,886
EDIT After all these months we are almost there. Parts are trickling in, we hope to have everything by the end of the month. Tthis will eventually become the help thread, I think, either that or I'll ask Ethan to delete it once I get the help thread up, cuz it will be unecessary. The original post is below here, please scroll down if you need it.
PRICING
See WM thread:
http://www.groupdiy.com/index.php?topic=46920.0
SHIPPING will be via USPS flat rate (we will try to ship each unit in it's own small box, it is the most economical way to do it for 1-2 units). If anyone decides to buy a ton, we'll probably do something as a special case. but for most people, this will be easiest/cheapest. About $5 each for domestic and $15 for international.
To PREORDER, please send an email to:
EQP1S5_preorder [at] analogallstars [dot] com (fix address first, of course):
Full name
Forum Name
Order details (how many units)
Shipping Address
Paypal address
-----------Original Post below (slightly edited for conciseness)-----------------
Passive filter circuit is based on a pultec type filter, similar to the enhanced/ultra-enhanced and the gyraf DIY circuits.
Amp circuit is the exact one DrPat posted ages ago (it has resurfaced recently take a look around here) from his original solid state pultecs, which use a 2520 opamp. Here is a pair that sold on ebay for $5750:
Parts:
Inductor: moly-permalloy toroidal core, what the old books state is the ideal core or audio frequency inductors, and which is very likely the core the old guys used (Pultec, Lang, and other passive LCR EQs). Largely made obsolete by accountants due to high cost vs cheap pot cores.
Taps at: 19mH, 26mH, 39mH, 78mH, 155mH, 312mH.
Matched cores for (potentially) +/-1.5% matching between whole batch. No guarantees but it's what I'm shooting for.
Transformers: same lams as the HS56, same winding pattern/style, same wire. Simple and sweet. Only part that was simplified is that we only pulled out the taps we need for this, so no 150Ohm or 62 Ohm taps available, for example.
Switches : grayhill shorting switches
Pots: Conductive plastic, metal shaft, mini mod-pot style.
Caps are Wima polypropylenes. I have paralleled caps in many places on the high boost, to get as close to the listed frequency as possible.
PCB images: you'll notice parts are missing, like a couple of wimas, and the transformer brackets, for example.
(removed faceplate pic, cuz it no longer looks like that. We changed color scheme to brushed Al/ clear anodized, with black knobs, to go along with the original. It looks much better! The internal pic is mostly the same, just cleaned up a bit.
EDIT: edited for (even more) clarity
PRICING
See WM thread:
http://www.groupdiy.com/index.php?topic=46920.0
SHIPPING will be via USPS flat rate (we will try to ship each unit in it's own small box, it is the most economical way to do it for 1-2 units). If anyone decides to buy a ton, we'll probably do something as a special case. but for most people, this will be easiest/cheapest. About $5 each for domestic and $15 for international.
To PREORDER, please send an email to:
EQP1S5_preorder [at] analogallstars [dot] com (fix address first, of course):
Full name
Forum Name
Order details (how many units)
Shipping Address
Paypal address
-----------Original Post below (slightly edited for conciseness)-----------------
Passive filter circuit is based on a pultec type filter, similar to the enhanced/ultra-enhanced and the gyraf DIY circuits.
Amp circuit is the exact one DrPat posted ages ago (it has resurfaced recently take a look around here) from his original solid state pultecs, which use a 2520 opamp. Here is a pair that sold on ebay for $5750:
Parts:
Inductor: moly-permalloy toroidal core, what the old books state is the ideal core or audio frequency inductors, and which is very likely the core the old guys used (Pultec, Lang, and other passive LCR EQs). Largely made obsolete by accountants due to high cost vs cheap pot cores.
Taps at: 19mH, 26mH, 39mH, 78mH, 155mH, 312mH.
Matched cores for (potentially) +/-1.5% matching between whole batch. No guarantees but it's what I'm shooting for.
Transformers: same lams as the HS56, same winding pattern/style, same wire. Simple and sweet. Only part that was simplified is that we only pulled out the taps we need for this, so no 150Ohm or 62 Ohm taps available, for example.
Switches : grayhill shorting switches
Pots: Conductive plastic, metal shaft, mini mod-pot style.
Caps are Wima polypropylenes. I have paralleled caps in many places on the high boost, to get as close to the listed frequency as possible.
PCB images: you'll notice parts are missing, like a couple of wimas, and the transformer brackets, for example.
(removed faceplate pic, cuz it no longer looks like that. We changed color scheme to brushed Al/ clear anodized, with black knobs, to go along with the original. It looks much better! The internal pic is mostly the same, just cleaned up a bit.
EDIT: edited for (even more) clarity
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