[Boatanchors] 6146 question

[Richard Knoppow]

    Maybe the case. I don't think RCA registered the tube, I am pretty 
sure that was Sylvania. Tube designed for mobile use with improved 
resistance to vibration. If RCA data shows the size to be the same it 
should be the same.

On 1/28/2024 4:19 PM, manualman at juno.com wrote:
> There's NO difference in height/length with the 6146's that I can find.
> 
> All tubes in the 6146 family are considered T12 bulbs.
> 
> Note: length equates to height.
> 
> RCA 6146A
> 3 1/8 inches +/- 1/8 length
> 
> GE 6146A
> 3.00 inches minimum length
> 3.25 inches maximum length
> 
> RCA 6146B/8298A
> 3 1/8 inches +/- 1/8 length
> 
> RCA 6146W/7212
> 3 1/8 inches +/- 1/8 length
> 
> NOTE: These length dimensions don't consider the length of the pins but
> since the pins go into a socket, who cares.
> NOTE: All the above tubes have the same diameter 1 21/32 inches
> 
> In all of these tubes, there are some minor inter electrode capacitance
> differences between some models but I never found it to be a problem in
> rigs from HF to 50 MHz. The consideration with any of these tubes is
> PLATE DISSIPATION and whether the power supply in the equipment can
> handle a sub to the 6146B's. The 6146B/8298A (and the Japanese S2001A)
> are rated for 35 watts plate dissipation whereas the earlier 6146 family
> and the 6146W are rated for approximately 25 to 27 watts plate
> dissipation.
> 
> Over the years I used 6146B's in my Heathkit Apache, HW-101, SB-101,
> SB-102, Valiant, Ranger, Hallicrafters HT-32's, B&W 5100B, and several
> Kenwood rigs and all worked very well with these tubes.
> 
> Obviously, at higher operating frequencies with this family of tubes,
> inter electrode capacitance, wire dressing, wire positioning and over all
> design can play an important part in problem less operation of your RF
> amplifier.
> 
> Pete, wa2cwa
> 
> 
> On Sun, 28 Jan 2024 13:09:27 -0800 Richard Knoppow
> <1oldlens1 at ix.netcom.com> writes:
>>      Not if the 6146B is too tall. The B really is a similar but
>> different tube. This may be of no significance for the Ranger.
>>
>> Richard Knoppow
>> Los Angeles
>> WB6KBL
> 
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-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998