[sdiy] tube preamp? / cheap board

[Peter Cornell]

Hi Henry & list

At Welborne Labs site there is a catalogue download and therein is a tube
phono pre based on Alan Kimmel's design. I've built some of his designs
before & they sound very good.

www.welbornelabs.com
go to Download (at the bottom of the page) then get the "Mods & Fun stuff
section".

Lots of good info here

Peter


----- Original Message -----
From: "Henry" <henry01 at ntlworld.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, January 28, 2003 8:00 PM
Subject: [sdiy] tube preamp? / cheap board


> Hi Folks, Joe,
>
> >After doing some research, I would like to preamp with tubes, but can't
> find any >good (inexpensive) kits for a tube preamp.  I think I may go
with
> the PAIA riaa >phone preamp, but not sure how it will sound.  Any
> suggestions?
>
> Yep.  Buy a bipolar transistor front end based design and turn on a 100W
> heater next to it.  The noise, hum  and distortion will be lower and you
can
> still keep warm.  Douglas Self seems to speak quite knowledgably on the
> subject in his book on audio, (see Amazon) and he tests his designs
> carefully with the appropriate gear, from what I've read.
>
> Separate point...
>
> There is an old supplier of surplus electronics equipment in Hove, Sussex
UK
> who are currently advertising stocks of some old keyboard units.  They
> consist of three octaves of full-size keys in a fairly substantial box.  I
> bought a couple of these recently out of curiousity and they turned out to
> be ones originally used with the Sinclair ZX spectrum, and have a bit of
> electronics inside to interface with the old dear.
>
> The keys themselves are cheap but usuable closing contact types, though
> unfortunately they do not have double closing contacts, so you'd have to
use
> some imagination to generate a gate signal, or frig something inside to
> double them up. (He does cheap microswitches too - 10 for a quid) All the
> same, at £15 for two they could easily be made into a cheap CV source for
> the workbench with a current source and some resistors.  The phone number
is
> 01444 881965 or email jnfactors at aol.com.  He has stocks of unused Hivac
XN11
> nixie tubes too.  (I have no connection with the company - so don't blame
> me:)
>
> Henry.
>
> www.monumentaltat.co.uk
>
>
>