I have used 1578, 6n1P, 6N8S and 6n23p. They are not always closely matched but I have never had one DOA.
Tubes from Russia block
What is your experience of using all those NOS tubes from the Russian block, especially those which are supposed to be military grade ones?
I always test the tubes I received using my calibrated tube tester. I am finding out many unpleasant surprises.
I got them from eBay and even U.S. internet stores (some are supposed to be reputable). They are hit or miss. More than 1/2 of them have short, DOA, completely different looking labels, poor matching, or just too noisy to be of any practical value. I am not sure if it's just my luck (or lack of).
If you happen to use those tubes, would you please share where you buy them from?
I always test the tubes I received using my calibrated tube tester. I am finding out many unpleasant surprises.
I got them from eBay and even U.S. internet stores (some are supposed to be reputable). They are hit or miss. More than 1/2 of them have short, DOA, completely different looking labels, poor matching, or just too noisy to be of any practical value. I am not sure if it's just my luck (or lack of).
If you happen to use those tubes, would you please share where you buy them from?