I got through to Dennis. The 5z4 will work fine in CJ5. Florida boy, I found two forum threads where a few people really liked the 5z4 in the rectifier slot versus the 5y3 in other preamps that use a 5y3. Less voltage sag etc. If I hear any noticeable difference I will report back. Have experimented with some Raytheon 6j5’s and have a pair of NOS Kenrad 6c5’s from 1944 that I will be trying out after burning in my new to me Pontus II.
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