New Project 88

chipco3434 · 1st January 2007, 08:52 PM

Here's a few shots...

Face plate is walnut... knobs are aluminum and something a little wild from the tropics. It's all in an old TiVo DVR box. Works great. Quiet.

chipco3434 · 1st January 2007, 08:53 PM

P88 from Rod Elliot... ESP

lineup · 1st January 2007, 09:53 PM

Quote:

Originally posted by chipco3434
P88 from Rod Elliot... ESP

very good quality work
perfect pre amplifier

Leolabs · 2nd January 2007, 12:36 AM

Nice preamp and nice household too.

taj · 2nd January 2007, 02:50 AM

Very cool. Nice work.

TomWaits · 2nd January 2007, 05:54 AM

Very good looking indeed. How is the sound? Where did you get the potentiometer extensions?

The view in the yard looks exactly the same as my dad's place out East. Weird?

Cheers,

Shawn.

taj · 2nd January 2007, 08:00 AM

I was kinda wondering about those extension shafts too. :-) I want one (or two).

..Todd

chipco3434 · 2nd January 2007, 10:35 AM

That's just 1/4" brass shaft. You would call it 6mm. It's a hardware store item. The hex things near the pots are coupling nuts. Drilled out to accept 1/4" and cross drilled and tapped for #6-32 set screws.

Nordic · 2nd January 2007, 02:18 PM

Which opamps did you settle for... I used opa 2132 and 2134 (had one left of each)... It is certainly ok, but not with the transparency you get form a simple transistor buffer.

Just got back from the shops (had to visit 3 to get all the components, but I am ready to try the Graham Maynard transistor buffer - I saw lineup mentioned it before in a class-a opamp discussion.

Cant wait to get it done... its just so damn hot here in the Cape today, I don't feel like lifting a finger.

chipco3434 · 2nd January 2007, 02:37 PM

NE5532's I have some BB 2134's I'll play with also...

I'm in preamp mode for the next month... I will finish his P97 in a discarded sat tv chassis, then on to complete a discreet class A pre. Pre's are a pain in the a$$ 'cause of all the shopping for unobtainium switches & pots. I'm just cheap.

From Rod...

While op-amps have something of a bad name in audiophile circles, what must be remembered is that between the music leaving the musician's instrument and arriving at your ears, there is every probability that it has already passed through somewhere between 10 to 100 op-amps - in the mixer (usually more than once), in external effects units, tape machines (analogue or digital), and finally in the CD player itself.

Many of these are not as good as the ones used in this design, and to dismiss a design simply because it uses an op-amp or three is to finish up spending far more than is necessary to obtain the same sonic quality. This is not to say that a good valve preamp (for example) will not sound better (or perhaps just different), but the "op-amp sound" is a myth which should not be perpetuated (and this is from someone who uses a valve and op-amp preamp, both of my own design).

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2nd January 2007, 12:36 AM	#4
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Nice preamp and nice household too.

2nd January 2007, 02:50 AM	#5
taj diyAudio Member Join Date: Feb 2005	Very cool. Nice work.

2nd January 2007, 05:54 AM	#6
TomWaits diyAudio Member Join Date: Aug 2005	88 Very good looking indeed. How is the sound? Where did you get the potentiometer extensions? The view in the yard looks exactly the same as my dad's place out East. Weird? Cheers, Shawn.

2nd January 2007, 08:00 AM	#7
taj diyAudio Member Join Date: Feb 2005	I was kinda wondering about those extension shafts too. :-) I want one (or two). ..Todd

2nd January 2007, 10:35 AM	#8
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	That's just 1/4" brass shaft. You would call it 6mm. It's a hardware store item. The hex things near the pots are coupling nuts. Drilled out to accept 1/4" and cross drilled and tapped for #6-32 set screws.

2nd January 2007, 02:18 PM	#9
Nordic diyAudio Member Join Date: Sep 2005	Which opamps did you settle for... I used opa 2132 and 2134 (had one left of each)... It is certainly ok, but not with the transparency you get form a simple transistor buffer. Just got back from the shops (had to visit 3 to get all the components, but I am ready to try the Graham Maynard transistor buffer - I saw lineup mentioned it before in a class-a opamp discussion. Cant wait to get it done... its just so damn hot here in the Cape today, I don't feel like lifting a finger.

2nd January 2007, 02:37 PM	#10
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	NE5532's I have some BB 2134's I'll play with also... I'm in preamp mode for the next month... I will finish his P97 in a discarded sat tv chassis, then on to complete a discreet class A pre. Pre's are a pain in the a$$ 'cause of all the shopping for unobtainium switches & pots. I'm just cheap. From Rod... While op-amps have something of a bad name in audiophile circles, what must be remembered is that between the music leaving the musician's instrument and arriving at your ears, there is every probability that it has already passed through somewhere between 10 to 100 op-amps - in the mixer (usually more than once), in external effects units, tape machines (analogue or digital), and finally in the CD player itself. Many of these are not as good as the ones used in this design, and to dismiss a design simply because it uses an op-amp or three is to finish up spending far more than is necessary to obtain the same sonic quality. This is not to say that a good valve preamp (for example) will not sound better (or perhaps just different), but the "op-amp sound" is a myth which should not be perpetuated (and this is from someone who uses a valve and op-amp preamp, both of my own design).

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