[Amps] Solid state amps

[DF3KV]

----- Original Message -----
From: "Dan K9ZF" <n9rla at yahoo.com>
To: <amps at contesting.com>
Sent: Friday, January 07, 2005 10:50 PM
Subject: Re: [Amps] Solid state amps


> Is it just me, or is building solid state amps 'cost prohibitive'?
>
> Mechanically, it would seem a lot easier to build solid state, but
the
> power fets just seem way too expensive.  For example, I  just read
the
> article Win posted.  So I looked up the price of MRF 154's.....$485
> each!  Add in some stuff like heat sinks and an arc welder size
power
> supply................
>
> Maybe I'm just cheap:-)

you do not need expensive mosfets for a linear and a big power supply,
Overhere linears with about 30-40 cheap hexfets IRF-820 etc are quite
popular,
supplied by a transformerless switching supply.
For 1,5 KW you need 50 of them

73
Peter