>Hello all
>I would kindly like your help to clarify a few points about this AMP as I'm
>considering buying a used one:
>
>1. What power output can be expected at 10-20 W input level? What's the mean
>gain ?
? c, 11db on the ssb tap.
>2. What should be the reading of plate voltage & current at the 100w input
>level?
? c. 650mA
>3. What is the idle state plate high-voltage of a good unit?
? c. 180mA on ssb-tap.
>The one I'm
>looking at has 1.6Kv / 2Kv (depending on mode cw/ssb switch).
>4. Is plate voltage supposed to drop when the amplifier is driven (at any
>input level)?
? yes
>this one has a 5%-10 % plate voltage
> drop at 40w-75w drive level - is this normal?
>5. Can 10m and/or 6m bands be added or does any such addition remove
>another band?
? 6m requires major surgery.
>6. Finally, what's a decent price for a 1985 unit in 90% physical condition,
>no mods, 240v ready,
> operation within 20% of specifications, no estimate of operating hours?
>
>Thanks in advance for your time to evaluate this.
>
? there is an article about the SB-220 on my Web site.
cheers, Isaac
- R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
www.vcnet.com/measures.
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