Alan, most all tube type linear amps are class B, or AB and can be single ended or push-pull. In RF service the tank tuning takes care of the output wave distortion making nice pretty sine waves. Linear amps are not class C because class C is really more like a switch than an amplifier. In most class C finals you can vary the input some and it will not make any difference in the output. For this reason they or good for CW and plate modulated AM. Class C finals have a characteristic of the output following the plate supply voltage up and down linearly. If the plate supply is dropped to half the RF output voltage will drop to half, and so on. For this reason the audio is inserted in the plate power supply line, hence plate modulated.
As for power levels, an SB200 is only about 3DBs better than getting rid of the control carrier modulator in the DX 60 (put it in the CW position) and building an external plate modulator for it. And it will sound a lot better. It is a really cheap project too. John, WA5BXO -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Alan Beck Sent: Thursday, March 16, 2006 8:34 AM To: Discussion of AM Radio Subject: [AMRadio] Amplifier to use with my DX-60 I would like to use a cheap am with my DX-60. An SB-200-230 seems to be a Class B amp. There for it only conducts on the positive going cycle. I don't mean to sound silly, but someone told me I could run this in SSB Mode using AM input from my DX-60, I run 100 Watts carrier for 400 Watts peak, now that makes sense. What does not make sense is how do I get the other side of the wave form???? The Tank??? I guess the tank. I really need to go cheap on this project. I know, you guys will probably say "go big or go home". Best 73 Alan
