I am working on a pp am build, parts gathering and circuit decisions.
I my power transformer rectifier heater winding is rated at 2 ma and the rectifier I would like to use has 1.8 ma draw per data sheet, am I stretching things with this load?
Or if rated at 2ma it's good at 2ma?
I my power transformer rectifier heater winding is rated at 2 ma and the rectifier I would like to use has 1.8 ma draw per data sheet, am I stretching things with this load?
Or if rated at 2ma it's good at 2ma?
A heater current of 1.8mA (milli-Ampere) doesn't make sense. You probably mean 1.8A.
What rectifier?
Missed post above.
What rectifier?
Missed post above.
Just wondering what rectifier?
The closest I could think of would be a GZ34/5AR4 having a heater current of 1.9A.
In any case if it's a 5V heater, be aware the the heater winding will be floating on B+, so must not be connected to anything else.
The closest I could think of would be a GZ34/5AR4 having a heater current of 1.9A.
In any case if it's a 5V heater, be aware the the heater winding will be floating on B+, so must not be connected to anything else.
Massive confusion at work on this thread. Common rectifiers run on 5V heaters,
not 6.3V. In addition what HV current do you need???😀😀😀
The 6D22S was originally a tv damper with 6.3V indirect heaters.
https://frank.pocnet.net/sheets/164/6/6D22Sspec.pdf
The datasheet even allows heaters common with other tubes up to 600V B+.
Remember, the top cap is the cathode and goes to B+.
Also you should be aware that a single 6D22S is only a half wave rectifier.
In which case you get DC in your HV transformer winding which will saturate it's core and cause it to overheat grossly.
For a full wave setup you need at least a second 6D22S tube and a center tapped B+ winding.
And another 1.9A of heater current, so a total of 3.8A ...
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The important question is what rectified current/voltage do you need for your design? Depending on that the 6D22S could be an overkill, or not.
I may use a 6au4 with diodes as a hybrid bridge.
Gets rid of the top cap.
I have a 6d22s in the junk stash and was thinking of trying it.
Gets rid of the top cap.
I have a 6d22s in the junk stash and was thinking of trying it.
A bridge has 4 diodes, 2 of which can be silicon.
6AU4 is again a half wave single.
You still need 3.6A from your transformer to heat two of them.
In your 1st post you said you have only a 2A winding, so ...
6AU4 is again a half wave single.
You still need 3.6A from your transformer to heat two of them.
In your 1st post you said you have only a 2A winding, so ...
So I'm am using 1 half wave rectifier tube and two diodes forming a center tap.
Bright is the wrong term?
Just a hybrid rectifier?
Bright is the wrong term?
Just a hybrid rectifier?
The tube in the picture is not a half wave rectifier.
It has 2 plates, two diodes with common cathode in one bottle.
That works.
But both 6AU4 and 6D22S have only one plate.
For your hybrid bridge you either need 2 tubes with one plate each
or a single rectifier tube with 2 plates ...
It has 2 plates, two diodes with common cathode in one bottle.
That works.
But both 6AU4 and 6D22S have only one plate.
For your hybrid bridge you either need 2 tubes with one plate each
or a single rectifier tube with 2 plates ...