[R-390] Audio Chassis mysteries

[rbethman]

Yep!

It can also be replaced with a 49 ohm 1% 10W resistor.

That had already been done in the '67 EAC I procured.

However, I was able to obtain several 3TF7s as part of a couple of 
complete tube replacements I obtained from a local Amateur Radio Operator.

Either one works, as well as the 12V filament tube, whose designation 
eludes me at the moment.

Bob - N0DGN

On 5/12/2012 11:49 AM, chacuff wrote:
> That's Rear Tied 5" Kielbasa in a #10 casing.  (RT-510)  Sometimes referred
> to as a 3TF7. (a common sub that's Kosher) Keeps everything working within
> spec as the voltage varies...  Generates a nice odor in a boatanchor.  Any
> oil it generates works good to lubricate the gear train as well....
>
> Back in hiding now...
>
> Cecil
> K5DL
> ----- Original Message -----
> From: "Barry"<n4buq at knology.net>
> To:<r-390 at mailman.qth.net>; "John Wendler"<wendlerjrv at gmail.com>
> Sent: Saturday, May 12, 2012 8:19 AM
> Subject: Re: [R-390] Audio Chassis mysteries
>
>
>>> Does anyone know what RT510 is?  the 5 in the number would appear to
>>> indicate IF chassis, but it appears in audio chassis on pg 93 of the
>>> manualin the resistance measurements.
>>>
>>> The caps are going to get replaced; I will be doing the "Mellow Cap"
>>> improvement.
>>>
>>> 73 de John N5CQU
>> RT510 is the 3TF7 ballast tube.  It is on the IF chassis.
>>
>> 73,
>> Barry - N4BUQ
>>