[Amps] Roller Inductor Choices

[Roger (sub1)]

On 4/15/2011 3:23 PM, Jeff Blaine wrote:
> Nice looking amp, Glen.
>
> 73, Jeff ACØC
> www.ac0c.com
>
> -----Original Message-----
> From: Glen Zook
> Sent: Friday, April 15, 2011 10:08 AM
> To: amps at contesting.com ; Roger (sub1)
> Subject: Re: [Amps] Roller Inductor Choices
>
> I recently built a 160-meter only amplifier using a pair of GI-7bT tubes.  It was easy to make a socket for them starting with one
> of the $2.99 aluminum mini-boxes that are sold at Radio Shack.  The cathode/heater ring connections used stainless steel hose clamps
> and the small heater connection used plate caps of the size for 6146 tubes.
>
> There are photos of this socket in the thread at
>
> http://forums.qrz.com/showthread.php?282380-Socket-for-Russian-tubes
>
> Photos of the linear are in the threat at
>
> http://forums.qrz.com/showthread.php?284611-Almost-ready-for-smoke-test!

Very nice looking layout.
One thing I would do differently would be to pressurize the cathode 
compartment and build chimneys to direct air up through the anode for 
more efficient cooling. But s you are not running the tubes hard I would 
think you have sufficient cooling.   If plate dissipation is any 
indication (and often it's not) a pair of the GI-7Bs should be capable 
of about 1200 watts out.


> Glen, K9STH
>
> Website:  http://k9sth.com
>
>
> --- On Thu, 4/14/11, Roger (sub1)<sub1 at rogerhalstead.com>  wrote:
>
> I don't know if the base is the same as the GI-7B but it might be. Check the sizes and if they are, there is a guy who makes sockets
> for them on e-bay.  You can mount them without sockets but they do need air for axial cooling...unless you change the cooler to one
> that works with transverse cooling.
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