[Boatanchors] 6146 question

[Richard Knoppow]

    Turns out I was wrong. RCA did register the original 6146, Sylvania 
registered the 6146A and RCA the B version:
    See: <https://k9axn.com/attachments/THE_6146B_STORY_9U2.pdf>
    By registered I mean the type number via the RMA, later RETMA.

On 1/28/2024 5:01 PM, Richard Knoppow wrote:
>     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

-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998