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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: 811 and 300B TUBE SOCKET PATTERNS posted by Will G. on February 18, 2021 at 18:58:56:
I have had that happen with some chinese octal johnson clones. a few things to check.
how long are the pins of the tubes in question compared to a 4 pin tube that seats properly?
Do the bottom of the pins have more of a radius at the bottom on the tubes that don't seat?
Do all of the pin receptors on the problem socket have the same distance from the ceramic?
Are the parts that grab the pin all parallel to each other?
If you watch from the bottom as you insert a "good based tube" you will see the straight sides of the tube pin extend slightly beyond the "pincers" that hold it and when you look at the probelm base I suspect the rounded bottom of the tbe will not break the critical edge to get side engagement and the pincers will be trying to grab the rounded bottom of the pin and just force the tube back up as they close.
dave
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Follow Ups
- RE: 811 and 300B TUBE SOCKET PATTERNS - dave slagle 05:46:39 02/20/21 (1)
- RE: 811 and 300B TUBE SOCKET PATTERNS - Will G. 16:35:07 02/23/21 (0)
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