New preamp

What people are working on at the moment
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pre65
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#1 New preamp

Post by pre65 »

I've now received my new preamp. Built by Philip Ramsey for his own use, but he thinks there may be an RF problem somewhere.

Anyway, it's in the system and playing, sounds good to me. :D

Here is one picture, more to follow when I take the base off and have a look inside.

Briefly, it's a choke input with valve rectifier and two chokes, ECC82 and 6463 valves and Audionote 1:33 output transformers. It has RCA phono and balanced outputs.

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Paul Barker
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#2

Post by Paul Barker »

Very nice . large chunks of iron for a preamp.
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pre65
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#3

Post by pre65 »

Paul Barker wrote: large chunks of iron for a preamp.
Large iron is good. :wink:
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pre65
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#4

Post by pre65 »

Been using it with the KT66 (trioded) amps and there seems more bottom end than with Pre3. :)

I think Mark would like how it sounds with the 18" woofers. :wink: :wink:
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Mike H
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#5

Post by Mike H »

Bringing it to Owsters?
 
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pre65
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#6

Post by pre65 »

Mike H wrote:Bringing it to Owsters?
Will do, not 100% sure I'm coming yet.

It seems I'm hearing more of the recording, the presentation is a tad more "up front", or a gnats less "laid back". :) .

Also, I seem to be playing things a little louder. :wink:

I'm pleased so far, and I think it has surpassed Pre3, which justifies the purchase. :lol:
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Dave the bass
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#7

Post by Dave the bass »

pre65 wrote: Also, I seem to be playing things a little louder. :wink:
...due to gigantic amounts of RF mush laying underneath the music...or 'cos yer old and deaf?! Heheheheh. :)

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pre65
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#8

Post by pre65 »

I opened it up yesterday (forgot to take a picture :oops:)

It's got a stepped attenuator, Audionote copper coupling caps and a smattering of Blackgate caps. The circuit boards are custom built with turret tags and very well laid out.

This morning I replaced the ECC82 with a 5751WA (cos I had one) but so far I can't notice any difference.

Next step will be to rewire the valve base and try a 6N6P in place of the 6463.
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#9

Post by pre65 »

pre65 wrote:
Next step will be to rewire the valve base and try a 6N6P in place of the 6463.
I've just realised that the 6N6P is wired up the same as a 6CG7, which is a 9 pin 6SN7, so that can be tried as well. :)
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pre65
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#10

Post by pre65 »

I'm trying the new pre with the 833a amps this morning.

It's a while since 833a was fired up so I'm getting used to the sound again. :wink:
The only thing necessary for the triumph of evil is for good men to do nothing.

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