21 Mar
2007
21 Mar
'07
7:10 p.m.
Subject: Re: single transistor projects?
From: woodelf <bfranchuk at jetnet.ab.ca>
Date: Wed, 21 Mar 2007 19:28:29 -0700
To: General Discussion: On-Topic and Off-Topic Posts <cctalk at
classiccmp.org>
Tony Duell wrote:
Its way OT but I run a RCA tube portable off 10 9V and 4 "C" cells
and it's very satisfactory. I took the old battery skin (cardboard label)
and made a wood box inside of it to hold the batteries so it even looks
like the real thing. Besides being the best AM broadcast radio I have
it's an attention getter. Runs for about 20 hours on alkaline C cells
and the 10 9V batteries usually outlast 3 to 4 sets of C cells.
These days, you can get 9V (PP3, 006P, 6F22, whatever you call them)
batteries very cheaply in the 'Everything's a pound' shops (I assume you
have similar shops that sell all sorts of things for a dollar a time). 5
to 10 of those in series will work as B battery, of couse.
Well you can still buy a B battery here on this side of the pond.
http://www.tubesandmore.com/ Personally,
I'd use a mains supply. a 30V transformer (15-0-15, ignoring
the centre tape or a pair of 15V windings in series) feeding a voltage
doubler rectifier (2 diodes, 2 capacitors) will give about 85V, ideal for
most 'battery' valve circuits.
They also sell a power pack kit too for small radios.
I suspect if you dig around over there you can scounge up
a better power supply, for the simple reason parts are whole
lot cheaper now than in one's youth.