I`m a little worried, i`m running 805 sets, and all voltages seem to be correct, and bias seems to be correct. The tubes are sounding great, the thing that worries me is that with all the lights out in the dark of night,i can see a very faint glow of red through the plates, is this standard for the 805 because of it`s very strong filament you cannot see it in the day, that`s how faint it is and it`s all over the plate not just in one spot, can anyone who runs 805`s look at theirs in the dark after it`s been on for a good hour and tell me if it`s normal, so i can get some sleep.
Thanks George
Thanks George
A slightly glowing anode is perfectly normal for the 805.
I have seen these tubes used in AM transmitters. In that service, the anodes were slightly red.
The same holds true for the 833 triode.
I have seen these tubes used in AM transmitters. In that service, the anodes were slightly red.
The same holds true for the 833 triode.
Thanks Frank, i can go to sleep tonight and not not dream about cherry anodes, you seem to know a bit about these tubes Frank, can you tell me, in all the data books i`ve read it says 10v for the heater none of them give any + or - figures, i`ve got 10.1v on one and 10.3v on the other, tell me to stop worrying and get some sleep.
Cheers George
Cheers George
cherry color
Just as George said: no worries.
I'm running my 833-based amp (also a 10 V filament) and yes....there is some plate coloration.
On the standard 833A there is a reddish spot visible in the middle.
On the carbon plate 833C only a very faint red.
Happy builing/listening,
Reinout
Just as George said: no worries.
I'm running my 833-based amp (also a 10 V filament) and yes....there is some plate coloration.
On the standard 833A there is a reddish spot visible in the middle.
On the carbon plate 833C only a very faint red.
Happy builing/listening,
Reinout
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