Author Topic: CK5702/6Ж1Б-В  (Read 3868 times)

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CK5702/6Ж1Б-В
« on: January 25, 2010, 12:25:28 PM »
I get a few CK5702 submini pentodes... any schematic/project with them? I cannot find anything.  ???

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Re: CK5702/6Ж1Б-В
« Reply #1 on: January 25, 2010, 01:31:05 PM »

3080

Re: CK5702/6Ж1Б-В
« Reply #2 on: January 25, 2010, 01:32:54 PM »
is it equivalent with 5840?


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Re: CK5702/6Ж1Б-В
« Reply #4 on: January 25, 2010, 01:45:38 PM »
The 5702 has very similar grid curves to the 5840 and has a higher plate dissipation (like 1.5 to 1.7W or somewhere thereabouts). I think you can actually use this as an output tube with a primary impedance in the 11k to 14k range.

3080

Re: CK5702/6Ж1Б-В
« Reply #5 on: January 26, 2010, 02:06:16 AM »
The 5702 has very similar grid curves to the 5840 and has a higher plate dissipation (like 1.5 to 1.7W or somewhere thereabouts). I think you can actually use this as an output tube with a primary impedance in the 11k to 14k range.

Is it possible to use your design with this tube? Any mods?


frequencycentral

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Re: CK5702/6Ж1Б-В
« Reply #6 on: January 26, 2010, 08:59:05 AM »
Worth a shot (on breadboard) providing you observe the correct pinouts! 5840 and 5702 pinouts differ.

3080

Re: CK5702/6Ж1Б-В
« Reply #7 on: February 02, 2010, 08:21:42 AM »
I built it... it works, but it is so silent... any tips to increase gain or the output volume?

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Re: CK5702/6Ж1Б-В
« Reply #8 on: February 02, 2010, 08:23:53 AM »
Try making the grid 2 resistor and the plate resistor into pots and see what you can dial in. Or you could try more volts: http://www.diystompboxes.com/smfforum/index.php?topic=74088.0


3080

Re: CK5702/6Ж1Б-В
« Reply #9 on: February 02, 2010, 11:11:08 AM »

PRR

Re: CK5702/6Ж1Б-В
« Reply #10 on: February 02, 2010, 08:24:07 PM »
At 12V?? It's gonna distort!   :D

Set the ratio of plate and screen resistors like the ratio of typical plate and screen currents. Fiddle the cathode resistor to set the plate roughly halfway up the power supply voltage.

Squinting too deep in the dark corner, I estimate 5702 at 12V perhaps like this:



If that aint happy, disconnect that stuff from G2, tie G2 to plate. It's maybe a better triode than pentode. You'll still get more distortion from a well-whacked guitar than you'll know what to do with.