[Amps] 6 mtrs:

[jeremy-ca]

RE: [Amps] 6 mtrs:
  ----- Original Message ----- 
  From: Steve Katz 
  To: Nils Petter Pedersen ; amps at contesting.com ; jeremy-ca 
  Sent: Tuesday, September 25, 2007 12:32 PM
  Subject: RE: [Amps] 6 mtrs:


  I question the high output power also, having built many amps and owned a number using 572Bs.  The pair of tubes are rated 320W dissipation and at 2.4 kV should produce about 640W PEP output power.  To push them beyond this, I've always found (in every circuit) it necessary to exceed the tube's grid current rating, even with very heavy loading, and that can't be a good thing. -WB2WIK/6



  Absolutely untrue. When run at the maximum Ig listed in the manual is when they are often at 750W or more. You may have used a few 572B's wheras Ive converted hundreds as well as numerous regular HF customer repairs. Add in all the other amps that use 572B's that have come thru here and the number goes up more.

  The 6M performance has often had me wondering what a SB-200 stripped down to a monoband 20M amp would do but Ive resisted the temptation.

  Carl

  KM1H