[ARC5] C-30 missing...

[Geoff]

> On 29 Oct 2012 at 20:22, Geoff wrote:
>
>> > output tube is missing. Apparently the original hacker removed it
>> > but never put it back.
>>
>> If its working that good why call the poor guy a hacker? Aint you got
>> no respect for someone probably long departed (-;
>
> Oh, gee! Ye're right. I apologize to his ghost.
>
>> Geez, get some
>> single malt.......
>
> Hey! Good idea. I need it today. :-)
>
>> > Even so, the audio output from this receiver is very loud. Plenty
>> > loud enough for a loudspeaker. I am using a 600 ohm to 8 ohm
>> > transformer feeding a Radio Shack small 4" square CB speaker. If I
>> > turn the RF gain all the way up, it will literally drive me out of
>> > the shack.
>> >
>> > So, is that capacitor really needed?
>>
>> Not really
>
> Kewel! Then I'll leave it out. No sense cluttering up the landscape.
>
>> > I thought that if one removed that capacitor, some negative feedback
>> > would result, and the audio distortion would be reduced, but that
>> > the volume would be reduced also.
>>
>> Correct. The capacitor is there to smooth and stabilize  voltage
>> variations across the cathode resistor. OTOH in a pure class A amp the
>> variations are minimal but manufacturers needed bragging rights for
>> Watts output. In an AB class amp its beneficial.
>
> OK. Neato! Thanks.
>
>> If I need more volume I put an electrolytic across the audio driver
>> cathode in sets that have a driver.
>
> None in this one, of course. I suppose if I decided to drive a 15" Jensen, 
> I
> might need one, but I sure don't with what I have.
>
>> A large value if the output
>> transformer can handle the lows. Ive brought distortion in some well
>> known receivers from 10%+ down to 2-3% and still have plenty of big
>> speaker volume even when dropping the B+ down to 220-230V which keeps
>> the 6V6/6AQ5 sets happy.
>
> Again, kewel! :-)
>
>> > FYI, the B+ is 240 VDC under load.
>> >
>> > I am copying an NDB, call is MW, here even in the daytime.
>>
>> I can log dozens during the day on the RAK, NC-240CS, and other
>> vintage commercial or military sets....with Beverages of course.
>
> Sigh....the only Beverage I have here is single-malt...you lucky dog.
>
> Ken


Well, Ive got this damn Frankenstorm trying to blow the house over. Im well 
away from the center but outer band blasts in the 65-70mph range are common 
on this exposed hilltop. Still got power and the rain so far is mild but as 
the storm heads to Montreal and then turns again to New Brunswick Im going 
to be in that outer band until the weekend....dont know what the rain total 
will be. Im getting it from 3 sides by the time its over. Luckily water runs 
downhill (-;

The genny is all ready to go.