Just a thought ... has anyone done
any calculations on the values for
a Pi-Network ?
I expect you will be surprised.
73, Dick, W1KSZ
On Fri, Nov 10, 2017 at 11:14 AM, Randall, Randy <Randy.Randall@uchealth.com
> wrote:
> See if you can find an RF generator from a MRI machine. The basics are
> there and you can as suggested in this thread outboard the input network
> and the output network in an external enclosure. I have seen them go for
> not a lot of $$ at hamfests and they are usually in working condition with
> anything from a pair of 3-500Z's to a 8877. They are well built, not
> abused, and usually the complete amp is in a single box. Most I have seen
> use hypersil xformers.
>
> Randy AB9GO
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Catherine
> James
> Sent: Friday, November 10, 2017 12:36 PM
> To: amps@contesting.com
> Subject: Re: [Amps] Amplifier for 630 meter band
>
> "U may well have a tough time stuffing parts into a SB-200 chassis. This
> is where a simple, bigger box would help out. Something like a single
> 3-400Z / 3-500Z would do the trick, dead simple. Then u could also stuff
> a 4-400 A / B /C in there as well."
>
> Yes, it may make sense to pull some of the larger tuning and LP filtering
> components into a separate case, outside the SB-200 case. One nice thing
> about VLF is that tolerances are very loose for things like lead lengths.
> Just be sure that wires carrying high voltages are very well insulated.
>
> I'm certainly open to having a second case with the additional filtering
> components. That second case won't have a power supply or tubes needing
> cooling, which simplifies things greatly.
>
> I'm not dead set on starting with an SB-200 by any means. If a junk 3-500Z
> or 4-400 amp drops into my lap, I could just as readily run with that. I
> will check out NEARFEST on the spring and see what turns up.
>
> If anyone in New England reads this and thinks they may have a suitable
> amp for sale (no tubes is fine, burned bandswitch is fine, power supply
> must be good, price must reflect condition; looking for a low-priced junker
> amp for extensive modifications), please reach out to me directly.
>
> 73,
> Cathy
> N5WVR
> <n5wvr@arrl.net>
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