[LCC] LCC Digest, Vol 129, Issue 3 (Scott's Amp voltage)

[Marcel Livesay]

 Hi Scott,
I tried to reply on my cell phone email, but I don't think it made it through.
1) Check your socket 240 voltage without the amp turned on.2) Check your voltage at your socket with the amp turned on.3) Check you voltage at your socket with the amp fully loaded.
I've seen more voltage sag during the peak summer months when everyone on the grid is running their air conditioners. Spring and fall is always better here for stronger primary power.
If you changed your power to your amp socket with smaller gauge wire, or added something else to the household AC service, you will have more voltage drop.
That's where I'd start.
Let me know what you find out. If you have no sag, then it can go back to your power supply.  A single bleeder resistor that is either shorted or has changed to a lesser value will add additional load to you High voltage DC.
,...over
Marcel N5VU
    On Wednesday, August 21, 2019, 12:00:08 PM CDT, <lcc-request at louisianacontestclub.org> wrote:  
 
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Today's Topics:

  1. Ameritron AL-1200 - power supply repair/upgrade (w5wz at w5wz.com)


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Message: 1
Date: Wed, 21 Aug 2019 07:09:13 -0500
From: w5wz at w5wz.com
To: LCC <lcc at louisianacontestclub.org>
Subject: [LCC] Ameritron AL-1200 - power supply repair/upgrade
Message-ID: <615d9c7db4d544caa716e126875de236 at w5wz.com>
Content-Type: text/plain; charset=US-ASCII; format=flowed

My AL-1200 is not putting out the power it used to.  I've noticed that 
HV at idle has sagged to 3,150-3,200 volts, and at key down drops to 
2,850-2,900 volts.  About 5 years ago, I replaced the HV filter caps and 
bleeder resistors.

The factory design uses 8 caps, 270mF @ 450v, 85C (8x450=3,600)  I've 
found an upgrade board that will use 10 caps (10x450=4,500).

https://www.ebay.com/itm/W7RY-Ameritron-Amplifier-Replacement-Capacitor-Board-10-Capacitors-4500-Volts/283294210547


Regarding the 10 cap board:

1.  Do you think that would be a good upgrade?
2.  Would this have a detrimental effect on tube life?
3.  Or would you recap again with factory components?

--Scott



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End of LCC Digest, Vol 129, Issue 3
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