[Milsurplus] BC-9 Project Update: 18 Jan 2016

[AKLDGUY .]

How about the 6C4?
It's a 7-pin triode, usually used in receiving applications, but it's a
pretty respectable
transmitting tube too.

Heater: 6.3V @ 0.15A
Plate dissipation: 5W
Max plate V: 350
Max plate I: 25
Max freq, full ratings: 54 MHz

At 300V and 25 mA, output is 5.5W.
Above taken from ARRL Handbook, 1963, Triode Transmitting Tubes section.

73 de Neil ZL1ANM


On Thu, Jan 19, 2017 at 5:16 PM, David Stinson <arc5 at ix.netcom.com> wrote:

> Got another 30 minutes to "play radio" tonight.
> Beginning to look like a triode-connected 6AQ5 is going to be the "right"
> tube to sub for the un-buy-able Western Electric VT-1.  Non-destructive
> "tweeks" needed to get it
> to work:  Bias voltage divider fixed-resistance
> reduced by bypassing from 10K Ohms to 5K.
> Take 220K across the plate resistor to reduce
> it from 100K to 69K.
>
> I will be building the loop from 3/8ths rigid
> copper pipe.  In the mean time, I'm fooling
> with connecting a coil in place of the loop
> and link-coupling it to my Delta Loop.
> The result was nice- good sensitivity.
> There's a CW contest going on so great signals.
> I've got a little "common mode" noise and
> the headphone cable and hand capacitance
> is causing a bit of "wibble-wobble" but the concept seems to work well.
> Tank is the small winding on the right.  Remember the
> thing is expecting a single-turn loop so the capacitor has a large value.
> Winding on the left is primary for Ant/Gnd.  This video was made using a
> lower-Z headset
> so the volume is lower.  When using the "normal"
> Hi-Z headset, signals are so loud I have to move
> the elements forward off my ears.
> https://goo.gl/photos/r7rWPuWKw2jTvuzM7
>
> I'm getting enough TX power out to tickle the Wattmeter a little.  Don't
> have a good reading on power yet because I don't trust what my scope is
> saying.
> 20 minutes here, an hour there.  Slow but steady wins the race ;-)
> 73 Dave AB5S
>
>
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