[HBR] Wrapped wires

[donald haworth]

Walt.  I have some questions about the dual triode mixer.  Is conversion
gain proportional to transconductance? And do you think a 6gm8 would make a
good mixer?
-thanks for sharing your expertise!
Don in Nashville

On Thu, Nov 17, 2011 at 12:31 AM, Walt Hutchens <waltah at earthlink.net>wrote:

> Tom said:
>
> > Looking at (and disassembling) old tube-type Tektronix scopes, you'll
> find
> > that they NEVER wrapped wires about terminals - they're run "through"
> lugs,
> > then soldered, but NEVER wrapped around.  Last time I looked, this works
> > just fine.
>
> Funny you should mention that.  I have a Tek 531A sitting awaiting
> disassembly for parts.   Last time I took trash to the recycle place, there
> it was ...
>
> I did open it up for a look and noted exactly what you say: No wrapped
> wiring.   AND a lifetime supply of various excellent quality parts.
>
> The 531A was the first really decent scope I used, back in grad school days
> and it's not going to be easy for me to part it out.   It helps only a
> little that I have a perfectly decent Tek 475 and when I applied power to
> the 531, it emitted smoke from somewhere in what looks like a power supply
> area.
>
> Geez, there must be a dozen 6DJ8s in there -- that's the tube that's a
> better triode mixer than the 12AT7 and 6J6, if you can afford it.   (The hi
> fi boys also like them so they are rarely cheap.)
>
> Actually, this is the RM 31A -- the rack mount version.   (A 531A turned
> sideways.)  Also what looks like an okay type CA plugin.   AND the manual.
>
> Walt
> KJ4KV
>
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