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In Reply to: RE: Google'd site posted by Tre' on March 27, 2016 at 19:27:36
The 6X5 and other 6V IDH rectifiers were designed to operate off the same filament supply as other 6V tubes in the circuit. Therefore it possessed designed-in h-k insulation capable of withstanding a typical B+ of roughly 300V. In most circuit designs of the era the 6X5 came from, the cathodes of the other tubes would be grounded either directly or thru a relatively low value resistor. The filament circuit of these tubes was also usually referenced to ground thru a center tap or by grounding one leg. If the 6X5 develops an h-k leak, B+ will be shunted to ground theu the heater circuit. If the filament supply is floating, a 6X5 h-k leak will raise the filament circuit to B+ level thus far exceeding the h-k voltage rating of the other tubes. Either case leads to circuit failure, sometimes catastrophic. Bottom line is that a 6X5 is defective if there is an h-k leak and shouldn't be used.
Follow Ups:
"The 6X5 and other 6V IDH rectifiers were designed to operate off the same filament supply as other 6V tubes in the circuit."
I did not know that.
That sounds like a dangerous practice to me.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
...and it saves a PT winding. Also eliminates need for a rectifier heater winding in 6V car radios where 6X5 was originally employed. Just connect all filaments directly to the battery.
Another type of rectifier where superior h-k insulation is employed is the TV damper. These usually come with a 900V h-k rating, avg current ratings in the multi hundred mA range and an unusually long warmup resulting from the additional h-k insulation mass.
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