I've put my meter across the pins. Looks like the heater is connected across pins 2 and 4, I get 1000 ohms.
Way too high resistance for a heater. Sounds like something is shorted internally. Measure across pins 2 and 7.
2 and 7 is open circuit. Could it be a faulty tube, or have I done damage if the tester was configured for the wrong tube?
I thought 1000 ohms looked about right for a heaterm
Edit. Pins 2 and 7 are measuring 2 ohms. My meter did not give a reading until changing the range to a lower one.
6L6 construction with big fins on the grid posts: probably a 7027(a).
Slightly different pin connections.
Slightly different pin connections.
I think you could be right.
Looks like these.
https://frank.pocnet.net/images/RCA/7/7027A_RCA_HM.jpg
The question is, I have no idea what the data is to set my tester for this tubes pinouts.
It's a weston 981 tester and I can't find any data online.
Looks like these.
https://frank.pocnet.net/images/RCA/7/7027A_RCA_HM.jpg
The question is, I have no idea what the data is to set my tester for this tubes pinouts.
It's a weston 981 tester and I can't find any data online.
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You can test it with 6L6 settings and 7027A pinout (Do not connect to pins 1 or 6 - otherwise standard 7AC like a 6L6).
YOS,
Chris
YOS,
Chris
Check the pinout with an ohmmeter. If 1 & 4 are connected & 5 & 6 are connected you have a 7027. Otherwise that's not the answer. Gotta keep looking.
Problem is I don't know what settings to set the dials on this tester to rewire the socket. I could make an adapter I guess.
Sorry I wasn't clearer. After confirming, as JHS says, that it's a 7027A, it tests like a 6L6. You're lucky to find these because geetah pickers have burned up almost all of them, making remaining American survivors valuable. How else ya gonna sound like Jimi?
YOS,
Chris
good to know its a rare tube, will be interesting to see what it tests, but I need to figure out the date to set this tester.
Can you test for continuity? Pins 2 and 7 are the heater in a 7AC socket. If good (less than an ohm), test as for a 6L6. Then, if G1 and G2 are duplicated, continuity tests as posted above, it's a 7027A (fancy version of 6L6). Done.
Chris
Chris
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I thought the pinouts were different for a 7027?
If they are interchangeable. I will put the meter on this tomorrow anyway, I never got round to looking at it today.
If they are interchangeable. I will put the meter on this tomorrow anyway, I never got round to looking at it today.
Just checked, and I can confirm this is the case.
Yup, definitely the case, heater measures close to 2 ohms.
Yes looks like there is some difference with the grid going to ground.
I dont know if the wiring for the tester is arranged differently for a 6L6, but it appeared to short when inserting it into the socket, i could hear it arcing.