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EF Johnson TBolt




 
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Author Topic: EF Johnson TBolt  (Read 481 times)
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N0YXO
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« on: April 07, 2021, 06:48:16 PM »

I have a Thunder bolt amp with a yl2gtm power rectifier board in it v1.o 4kv/5a. Can  any one give me any info on this product ?
not sure if it is installed correctly it was not finished installed  when I acquired the amp.   
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KA2PTE
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« Reply #1 on: April 07, 2021, 08:53:13 PM »

Sounds like something to maybe replace the original HV diode tube rectifiers it had. Got any photos?
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N0YXO
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« Reply #2 on: April 07, 2021, 10:30:11 PM »

That is what it replaces the hi voltage rectifying tubes and caps will post pic's tomorrow 
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N0YXO
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« Reply #3 on: April 08, 2021, 05:43:41 PM »

This is the board


* P4080565.JPG (2063.74 KB, 3648x2736 - viewed 62 times.)
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W1NB
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« Reply #4 on: April 08, 2021, 07:27:01 PM »

What is it that you need to know about it?
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N0YXO
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« Reply #5 on: April 08, 2021, 08:40:17 PM »

Just trying to get some info on it after I drew out the schematic of it I understand how it works
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KA2PTE
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« Reply #6 on: April 08, 2021, 10:53:31 PM »

Looks like (5) 450V caps in series for 2250V, then another set in parallel probably to filter the HV....and a string of diodes to I guess do the rectification.
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N0YXO
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« Reply #7 on: April 08, 2021, 11:10:03 PM »

This is how it is wired


* IMG_0810.JPG (67.14 KB, 640x480 - viewed 66 times.)
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MikeKE0ZUinkcmo
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« Reply #8 on: April 09, 2021, 06:52:46 AM »

Looks like it should work fine, although there are twice as many capacitors as the original PS Schematic.
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Mike KE0ZU

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« Reply #9 on: April 09, 2021, 11:53:38 AM »

the extra capacitors are there in case the HV bleeder goes open .... this is very conservative design
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MikeKE0ZUinkcmo
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« Reply #10 on: April 09, 2021, 05:19:25 PM »

If ANY bleeder goes open all the other caps are going to bleed toward ZERO or to what ever leakage current the "open" cap goes to, just before it (probably) shorts from too much EMF.      

What value, and Voltage rating are the caps, something like 80-100F @450VDC?
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Mike KE0ZU

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Detroit47
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« Reply #11 on: April 10, 2021, 12:50:40 AM »

Looks like it should work fine, although there are twice as many capacitors as the original PS Schematic.

There is only one 8uf filter cap on a stock T bolt. It has a choke input supply. Pretty funny.

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Pete, WA2CWA
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« Reply #12 on: April 10, 2021, 01:06:11 AM »

Looks like it should work fine, although there are twice as many capacitors as the original PS Schematic.

There is only one 8uf filter cap on a stock T bolt. It has a choke input supply. Pretty funny.

N8QPC

There was two versions of the Thunderbolt with major changes in the HV supply. There were other minor changes between the two but for this thread, the discussion is HV power supply.
See attached



* tbolt-early.jpg (73.33 KB, 1063x489 - viewed 42 times.)

* tbolt-late.jpg (61.32 KB, 781x332 - viewed 42 times.)
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« Reply #13 on: April 10, 2021, 09:30:10 AM »

Mike ... what I see from the photo are 470 uF @ 450V Nichicons ... I agree with what you say about equalizing res across each cap ... I was referring to overall HV bleed resistance which is fairly low value and high wattage ... can you say wump at turn on   Grin
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N0YXO
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« Reply #14 on: April 10, 2021, 02:43:15 PM »

I have what appears to be the later one of the two models. I have installed in rush limiters in the path of the plate transformer the choke is in line with the caps I received no info of what was done with it the board has been modified from original configuration from what I can tell it was close to a Tbolt 2 power supply that I have acquired print of       
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WA1HZK
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« Reply #15 on: April 10, 2021, 04:56:37 PM »

The one thing about those amps is that they were designed to use a CB set for a driver. Anything over around 3 watts is too much. Also, the power supply is very wimpy for those tubes. Under perfect conditions you can make 125 watts of AM but no more without losing your headroom.
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MikeKE0ZUinkcmo
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« Reply #16 on: April 11, 2021, 10:21:34 PM »

As Carl mentions there were two distinct versions.  The second version up'd the capacity from 8uF to about 13uF, but47uF I'd say is far in excess of what's needed.   Mine still has the original 8uF Oil cap but before it goes on the ops bench again, it'll get the late model fix.

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Pete, WA2CWA
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« Reply #17 on: April 12, 2021, 12:22:05 AM »

As Carl mentions there were two distinct versions.  The second version up'd the capacity from 8uF to about 13uF, but47uF I'd say is far in excess of what's needed.   Mine still has the original 8uF Oil cap but before it goes on the ops bench again, it'll get the late model fix.

Is Carl here?? Grin
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MikeKE0ZUinkcmo
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« Reply #18 on: April 12, 2021, 07:18:25 AM »

Quote
...Is Carl here??  Grin...


CARL!! Who's Carl?  Carl's not here!! 

OOPS, Sorry Pete!!
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Mike KE0ZU

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