[Amps] RF Parts OEM 3-500ZG's

[Mike Schatzberg]

Hi Louie:

Yes, I agree with you.  They apply some standard bias voltage, and read the plate current at idle.  They then select the same idling current pairs for shipment as matched.

Good to hear from you, hope all is well there.  The caps you sent me are working well, many thanks.

Best regards,

Mike 
WB2AJI
  ----- Original Message ----- 
  From: Gudguyham at aol.com 
  To: cherokeehillfarm at earthlink.net ; W4EF at dellroy.com ; amps at contesting.com 
  Sent: Monday, August 08, 2005 11:42 AM
  Subject: Re: [Amps] RF Parts OEM 3-500ZG's


  In a message dated 8/8/2005 9:02:58 A.M. Eastern Standard Time, cherokeehillfarm at earthlink.net writes:
    All of these tubes have worked flawlessly.  I think it is a good idea to 
    purchase the matched tubes, because I believe the matching, although not 
    done dynamically under load, means that RF Parts themselves have checked the 
    tubes before shipment.  Just one more chance to catch a defective unit 
    before it gets to you is worth something.


  Mike, I too have used RF Parts and Taylor tubes in my 6 meter SB-220 conversions, they tend to be stable and make as much power as any Eimac tube I have tried in the same amp.   When they match them it seems as though (by the marking numbers) that the tube is put in a jig, and the resting plate current is read on an accurate meter, then marked with the current it draws at idle, tubes with the same numbers are "matched".  I may be wrong on this, but it seems that this may be the way they do it.  73 louie W1QJ