[R-390] A Few Questions for the Group

[MURPH]

Hi all
	I am getting ready to dig deep into the R390A that I have and I have a few 
questions for the group.
	1. Has anyone changed the tube type and circuitry to support  quieter 
tubes as described in ER magazine #26 June 1991 ? I.E. Change most of the 
IF tubes to 6JH6's. Change the RF amp to a 6GM6. Change most of the mixers 
to 6HA5's.
	2. Can anyone strap an oscope to the IF output on the back panel to get a 
measurement with the carrier level meter at 50db?
	3. What is the rg number for the mini coax that is used through out?
	Thanks in advance
Richard