small valves and RE: OT
ajp166 at bellatlantic.net
Sun Apr 24 18:44:13 CDT 2005
>Subject: Re: small valves and RE: OT
> From: ard at p850ug1.demon.co.uk (Tony Duell)
> Date: Sun, 24 Apr 2005 22:02:54 +0100 (BST)
> To: cctalk at classiccmp.org
>1R5 = DK91 == Pentagrid changer
>1U5 = DAF92 == Detector and 1st audio
>1T4 = DF91 == IF amplifier
>3V5 isn't in the equivalents book, but 3V4 = DL94 == audio output
>And of course the 117Z4 is a rectifier with a 117V filament.
I have the RCA small tube handbook. I started as a bag carrying
radio tech in the 70s and still fix stuff. I started with tubes
and recently built some tube radios for fun. I have a pair of
4CX250s itching for a 1kw input amp for 6M. I haven't succumed
yet as I like to do radio stuff at QRP levels for the challenge.
>I am sure I don't need to warn you about this, but it's almost certainly
>a live chassis set when run off the mains.
I bought and keep a isolation transformer for just such repairs when
needed back in 1969. However that radio has a phenolic case thats
in good shape and is therefor insulated.
>> If it breaks I will. Believe it or not I use it to listen to local station
>> for ball games.
>No why on eart hwould oyu want to do that???
The local station for RED SOX baseball is WEEI 850khz! It's the best
AM radio I have. I have spares for the tubes.
>Oddly we can get Nuts and Volts and more usefully Circuit Cellar in shops
>in the UK... IMHO Circuit Cellar has really gone down over the last year
>or so, it seems to be just yet-another-microcontroller-circuit now, and
>quite often the microcontroller picked doesn't seem to be the most
>appropriate device .Oh well...
On rare occasions I see Elector, nice mag. I tend to delve into fairly
serious stuff like DSP and UHF radio so the ARRL pub QEX is a favorite
alone with Trade rags like Electronics Design. Around here there's about
30 linear feet of shelf allocated to linear and RF as well. So I have
oddities like Electronics Engineers casebook (ca1960) that has ED article
compilations about things like MIT/Lincoln TX2 and non computer stuff
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