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Author Topic: 6146??? 6146B - w  (Read 35774 times)
KAPT4560
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Posts: 554




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« Reply #75 on: December 31, 2018, 10:03:48 AM »

 The nostalgickitscentral website has some Heathkit service bulletins about tube brand/suffix/build date problems. I have incorporated some of the bulletins to improve performance.
 https://www.nostalgickitscentral.com/heath/heathkit.html
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KX4OM
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Posts: 364




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« Reply #76 on: December 31, 2018, 04:38:31 PM »


......

The 6146B was deliberately designed to compete with sweep tubes especially in class AB1 mode.  What do you do to a beam type tube to accomplish this.
.....
Regards Jim       

Which sweep tubes, exactly? I haven't seen that in the literature.

Ted, KX4OM
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G3RZP
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Posts: 1265




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« Reply #77 on: January 01, 2019, 02:43:06 AM »

Back in 1953 when the 6146 first appeared, there were very few (if any) commercial amateur rigs using sweep tubes. Most used 807s at that power level, one reason being that they and the 12 volt version, the 1625, were extremely cheap because of the number of WW2 surplus ones around. Some early post war TV sets in the UK even used 807s in the horizontal sweep function because of the low price.
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KD0REQ
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« Reply #78 on: January 01, 2019, 08:44:21 AM »

I always thought the 6146 was a higher power upgrade of the 2E26 for a larger market.
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K9AXN
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Posts: 442


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« Reply #79 on: January 01, 2019, 06:17:21 PM »


......

The 6146B was deliberately designed to compete with sweep tubes especially in class AB1 mode.  What do you do to a beam type tube to accomplish this.
.....
Regards Jim       

Which sweep tubes, exactly? I haven't seen that in the literature.

Ted, KX4OM


When did the 6146B come to market?  Were there any sweep tubes available and for how long?  Both the low and high power sweep tubes were integrated into ham gear.  Exactly what are you asking??

     


Regards Jim
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K9AXN
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« Reply #80 on: January 01, 2019, 06:50:12 PM »

Back in 1953 when the 6146 first appeared, there were very few (if any) commercial amateur rigs using sweep tubes. Most used 807s at that power level, one reason being that they and the 12 volt version, the 1625, were extremely cheap because of the number of WW2 surplus ones around. Some early post war TV sets in the UK even used 807s in the horizontal sweep function because of the low price.

Interesting info.  History is full of surprises. 

Regards Jim
« Last Edit: January 01, 2019, 06:52:41 PM by K9AXN » Logged
KX4OM
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Posts: 364




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« Reply #81 on: January 03, 2019, 02:56:33 PM »

Jim,
What I am asking is what is your source for your statement about 6146B tubes were being designed to compete with sweep tubes, (especially in Class AB1 mode.)

The Kenwood TS-520 came with the Japanese equivalent of the 6146A, the
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KX4OM
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Posts: 364




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« Reply #82 on: January 03, 2019, 03:43:10 PM »

Darned tablet, I hit send prematurely by accidentally. Then I couldn't type fast enough in "modify post" to add more. Short version is that I think the land mobile, military and industrial markets drove the enhanced 6146B development. By the time new rigs like the Uniden/Tempo 2020 (I have one) and the Yaesu FT-101 ZD were made, they used the Japanese equivalents to the 6146B, as did the Kenwood TS-530S, which I had. Galaxy kept on producing their twin-tube sweep tube PA rigs, topping out with the GT-550 at 550W PEP input. I have a working Galaxy V Mk2, and retired V Mk3 and GT-550.

Ted, KX4OM
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K9AXN
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« Reply #83 on: January 03, 2019, 07:03:39 PM »

Darned tablet, I hit send prematurely by accidentally. Then I couldn't type fast enough in "modify post" to add more. Short version is that I think the land mobile, military and industrial markets drove the enhanced 6146B development. By the time new rigs like the Uniden/Tempo 2020 (I have one) and the Yaesu FT-101 ZD were made, they used the Japanese equivalents to the 6146B, as did the Kenwood TS-530S, which I had. Galaxy kept on producing their twin-tube sweep tube PA rigs, topping out with the GT-550 at 550W PEP input. I have a working Galaxy V Mk2, and retired V Mk3 and GT-550.

Ted, KX4OM


Ted,
Please review the following url:  http://k9axn.com/_mgxroot/page_10935.html , the story and timeline and look at the visible and infrared signatures of the various tubes.  One thing that is not included is the FAA 6146W which was a super hardened 6146 that I believe you had purchased several of, encountering trouble.  When you say the 6146B equivalent, it generally speaks to the RCA 6146B and it's claim to being "Unilaterally replaceable for the earlier 6146's" --- it's not so and as Glen stated they rescinded the statement.  The RCA 6146 family that were built after 1963 are Sylvania technology for the heater and tube characteristics but the plate was not enhanced --- they simply stated that the tube temp could be run 40C higher from 220C to 260C    The Matsushita S2001A is also Sylvania technology but further improved.  The url above will divulge the details.  As for sources, the paper above speaks for itself or USN NSD ESO Great lakes Sylvania and RCA vendor interviews and personal testing of the Matsushita S2001A.


Read the url --- should answer all of your questions.  There is more detail to the story but still looking through the archives for notes.


Hope you had a Merry Christmas and Happy New Year!


Regards Jim


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K3UIM
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Posts: 396




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« Reply #84 on: January 04, 2019, 07:50:47 PM »

heres a video.. if anything you like to see to help give a idea.. let me know. ill try and do a video for it..
these same valves.. 6146W's in a 101ZD show about 50 watts on 10m and 100 watts on 75m... no idea if it helps....the 6146A's that been in radio for over 20 plus years are only giving about 35 watts on 6m...
 
https://youtu.be/ARlLnCEvrQY
I may be out in left field, but it looks like your meter comes to rest below the zero point with the rig "off". Perhaps if you zero the meter at rest, you'll get a more accurate output reading.
Just my 2 cents.
Charlie, K3UIM
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KX4OM
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Posts: 364




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« Reply #85 on: January 09, 2019, 07:27:11 AM »

I'm wondering where the GE tubes fit in all of this, design-wise. If I remember correctly, the K9STH document addressed the issue of Heathkit and the integrating of the 6146B, labeled as a 6146A.

Also, series connection of different versions: the tubes would have the same current in the filaments, with different voltage drops if the resistances were different. How about if they were connected in parallel? The tubes would have different filament currents with equal voltages. It seems to me that either would be bad.

Ted, KX4OM
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