Topband: Anyone have a boat load of J-310s?

[Charlie Cunningham]

Yes, we could swing the grids of those tubes quite a ways before
encountering enough non-linearity to produce a significant amount of
intermod, Andy!  The old original AMECO tunable vacuum -tube preamp, that I
borrowed from Bill, K4CIA, worked really well with my KAZ terminated RX loop
for the low bands. It was  connected to the receive antenna port on my
FT-1000MP, so I wasn't blowing FETs!

My electronic design career began before the end of the vacuum-tube era, and
I used the 6DJ8 commercially in some VHF monitor receivers, as a cascode RF
stage in the front-end.

73,
Charlie, K4OTV


-----Original Message-----
From: Andy Ikin [mailto:andrew.ikin at btopenworld.com] 
Sent: Sunday, August 25, 2013 5:16 PM
To: Charlie Cunningham
Cc: Topband Reflector
Subject: Re: Topband: Anyone have a boat load of J-310s?

Thirty years ago I used 6DJ8 (E88CC) to solve a third order IMD problem with
tuned loop that was using J310s.

The IMD was caused by Radio Free Europe on 13m.

73

Andrew
----- Original Message -----
From: "Charlie Cunningham" <charlie-cunningham at nc.rr.com>
To: "'Andy Ikin'" <andrew.ikin at btopenworld.com>; "'Topband Reflector'" 
<topband at contesting.com>
Sent: Sunday, August 25, 2013 9:14 PM
Subject: Re: Topband: Anyone have a boat load of J-310s?


> Of course,  a 12AT7, or better, a 6DJ8, would be excellent preamps as 
> well,
> and aren't so sensitive to transients etc.  :-)  (Showing my age, I 
> guess!)
>
> -----Original Message-----
> From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Andy 
> Ikin
> Sent: Sunday, August 25, 2013 3:58 PM
> To: Topband Reflector
> Subject: Re: Topband: Anyone have a boat load of J-310s?
>
> As far as am aware On-Semi still make the TO-92  J310. Fairchild ceased
> production about 2 years back. I did a last time buy from Mouser for 
> several
>
> thousand J310 and the much more linear J309.
>
> 73
>
> Andrew Ikin G8LUG
>
>
> _________________
> Topband Reflector
>
> _________________
> Topband Reflector
>