Why would you want to build a push pull amplifier?
Single ended is much simpler.
73
Gary K4FMX
> -----Original Message-----
> From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Brad Osburn
> Sent: Wednesday, June 17, 2015 5:21 PM
> To: Charlie; amps@contesting.com
> Subject: Re: [Amps] tetrode push-pull amp schematics
>
> Charlie,
> Under the heading of For What it's Worth
>
> I too am building a push-pull amp (4CX1500B). Basically I'm using Rich's
> single ended broadband input (4:1 balun xfmr terminated in 200 ohms, 100
> either side). Which I have completed and according to my impedance
> meter,
> looks good. I don't care about power just want a clean signal, so I'm
> thinking of running class A. I'm down to the tank circuit and I think
> I'm
> going to have a balanced output into my horizontal loop antenna, (600
> ohm
> ladder line input) thru a 4:1 balun. For a screen supply I'm again
> using
> Rich's zener string off of the plate supply. Generates a whole bunch of
> heat thru the dropping resistor, but I think it should prove to be
> pretty
> full proof.
> May incorporate the 4:1 balun in my tank circuit by going to a 200 ohm
> output, as I said I'm still designing. Found quite a few designs in the
> 1949
> Handbook. I built Rich's balanced tuner and it works well, may
> incorporate
> that in my output as well.
>
> This is my first amp I've designed so I'm just trying for 160-80-40.
> Using
> a 2400 volt control transformer (5kva) for my supply and I took 5VDC
> linear
> supplies and redid the control board to give me the 6V+- out I need for
> filaments and so I have a regulated filament supply. Limit inrush to
> less
> than 2X.
>
> For the record Rich said don't do it (band switching). But I've wanted
> to do
> this since HS.
>
> Brad
> AB0YD
>
> -----Original Message-----
> From: Charlie
> Sent: Wednesday, June 17, 2015 12:41 PM
> To: amps@contesting.com
> Subject: [Amps] tetrode push-pull amp schematics
>
> I am looking for a schematic of a push pull tetrode amp. Any ideas?
>
> Thanks,
>
> Charlie
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