[Amps] Mica Condensers

[GGLL]

	Hello, I have two capacitors, NOS both, manufactured by Soshin Denki K.K., 
one is Type A-2, 0.01uF, T.V. 5 KV DC, and a stamped number (date code?) 
61-8.
	The other is Type A-1, 0.01uF, T.V 3 KV DC. the ¿date code? is 62-3.
	Both +- 10%.
Are these useful for +B decoupling (bottom's plate choke decoupling)?, upto 
2500 V operating voltage?. Any other test precaution?.

Thanks in advance
Best regards
Guillermo - LU8EYW.