small valves and RE: OT

[Allison]

>
>Subject: Re: small valves and RE: OT
>   From: ard at p850ug1.demon.co.uk (Tony Duell)
>   Date: Tue, 26 Apr 2005 00:13:41 +0100 (BST)
>     To: cctalk at classiccmp.org
>
>Sure.... The reason I looked up the equivalents is that I don't know US 
>valve numbers that well, and they don't tell me that much cabout the 
>valve. The Philips/Mullard numbers are much more useful in that respsect 
>-- the initial 'D' means a 1.5V filament (E would be 6.3V, etc), the 
>other letters give the electrode structure (A = diode, F = signal 
>pentode, K = heptode or octode frequency changer, with the phantom 
>cathode type of design (H would be a hexode or heptode designed for a 
>separate oscillator), L = output pentode, etc...) and the '9' tells me 
>it's a 7 pin miniature base (B7G). 

I also have a Phillips/Mullard and Eimac manuals.  I should have used 
numbers more common there.  I see both here so it's no big deal. For 
example a homebrew RX for 80/75m uses an eclectic mix, 6AN8 Mix/LO,
6AU6 455khz IF, 6BH6 455khz regenerative detector, 6DS4 BFO, and an 
ELC84 first audio and power output.  All built into a 7x7x2.5" chassis
with power transformer and all stages shielded as needed.  Works 
very nice.

>Sure. My warning, again, was based on the fact that you're likely to get 
>inside the set (but as I said, I am sure you realised the dangers anyhow).

The dangers are less here with 117V nominal mains.  However I've been 
at this racket for over 35 years.  It's usually me telling others to 
be careful and lockout/tagout.

>> The local station for RED SOX baseball is WEEI 850khz!  It's the best 
>> AM radio I have.  I have spares for the tubes.
>
>My comment was not 'why would you want to listen to that radio' (that is 
>obvious, valve radios are good to listen to), but 'why would you want to 
>listen to sports when there's plenty of hacking to do' ;-)

Simple matter Holmes, background noise.  That and I live near Boston!
Besides if it's not a Sox game it's likely to be 6 Meter band action 
if any in the background. 


Allison