1626's watt?

[hhocean]

I am confused about 1626....
In the datasheet, like this
1626 datasheet

It's plate Input max wat is 6.25W and plate disspation is 5W.
If I set the max plate watt is 5.5W, the output power of 1626 is less than 0.7W ( even less than 0.6W)

If I set in 6.25W, I didn't get more than 0.7W.

But.....

I want to make a SE Amp for 1626. The crude estimation, 1626 should be reach in 1W ( 20% of max plate disspation watt).

Have any work point is better than I set in plate 200V, bias -24V.

 

[skyraider]

Just build it. 0.75w or 1w makes no difference to volume.

 

[skyraider]

BTW, can I ask you where do you get the tubes?

I have been looking for sparekeeping, but it seems like theres no more around..

 

[CWChang]

I got it by a seller in Taiwan. He has more than 200 tubes... I only buy 4 tubes. BUT he sold all tubes yesterday... It seems someone want to store this tube...

 

[alejo]

see this page http://www.geocities.com/bobdanielak/darling.html

 

[PRR]

> 20% of max plate disspation watt

That is VERY crude, and often not true.

> any work point is better than I set in plate 200V, bias -24V.

The 1626 is almost dead below 100V. So at 200V supply, you can only swing barely 100V, half your input power is wasted.

In theory, use a much higher supply voltage. But: the 1626 is not rated for a high supply voltage, you will have to reduce bias current so the plate won't melt, and that quickly leads to a load impedance that is awful high for best sound.

The 1626 was designed to be a very clean radio oscillator. In most applications, it would be adjusted for cleanest output, and then its weak power boosted-up in power amplifier stages. Yes, you can also use it to drive a load directly, but it was not designed to make big power and you are stuck with that fact.

As Skyrader says: half-watt or whole-watt is not much of a difference. I've had lots of fun with an efficient speaker and a 0.3 watt amp. When I need more, I need MORE, like 10 or 100 watts.