[Heathkit] Question on 6146A Tube

Fri, 29 Aug 2003 20:01:02 -0400

Good info from Glen.

The B is a higher gain tube so it can become unstable in marginally designed
circuits.
In addition it is capable of increased plate current so watch out you dont
overburden the PS.

One other family member is the 6146W, a mil spec version of the 6146.

Ive used RCA since I built an original DX100 back in 1956; no complaints
that couldnt be traced to operator stupidity.

Carl
KM1H
----- Original Message ----- 
From: "Glen Zook" <[email protected]>
To: "Kim Herron" <[email protected]>; "Jim Simmons, kf4tun"
<[email protected]>; <[email protected]>; <[email protected]>
Sent: Friday, August 29, 2003 6:09 PM
Subject: Re: [Heathkit] Question on 6146A Tube

> Don't use 6146B tubes without first neutralizing them.
>  If the tubes won't neutralize, then go back to 6146
> or 6146A types.  If they do neutralize, watch them for
> a few hours.  If the neutralization changes, then
> replace them with 6146 or 6146A tubes.
>
> The 6146B is NOT the same tube as the 6146 and 6146A
> and they often cause problems when used in place of
> the 6146 / 6146A / 8298.  This is due to the fact that
> the 6146B / 8298A types often "take off" due to the
> differences in construction.
>
> The article that was published in Electric Radio a
> couple of years ago about the 6146 family of tubes
> (and has been republished in various other
> publications since then) can be found on either of the
> websites that are listed at the end of this message.
>
> RCA was probably the best manufacturer of 6146 type
> tubes (all three types!).  They basically "invented"
> the tube type!  It will not hurt to mix brands and
> even mixing 6146 with 6146A (the main difference is
> the "make up" of the heater).  But, NEVER mix a 6146 /
> 6146A with a 6146B.  That is really asking for
> trouble!
>
> Glen, K9STH
>
>
> --- Kim Herron <[email protected]> wrote:
>
> Get rid of both of them and get a pair of Sylvania
> 6146B's.  I wouldn't use a RCA 6146 in anything!  Do
> your best to not mix different brands in the your
> finals.
>
> All I use is RCA's  They run just great on my 7
> transmitters and transceivers.
>
>
> =====
> Glen, K9STH
>
> Web sites
>
> http://home.comcast.net/~k9sth
> http://home.comcast.net/~zcomco
>
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