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General Support Question (Read 5118 times)

Reptar Senior Member Offline Posts: 58	General Support Question 09/10/19 at 23:19:16 Does anyone know if you can safely substitute a 12BH7A for the 12AU7 in the ZROCK2? I searched the forum but didn't see anything. The 12BH7A has higher heater current requirements than the 12AU7. Thoughts? Thanks! Steve
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Rivieraranch Seasoned Member Offline Posts: 2162 x0\|Ft. Lauderdale\|USA\|\|0\|0\|FL,Florida	Re: General Support Question Reply #1 - 09/11/19 at 03:08:33 Wouldn’t harm anything. I tried one in my ZSTAGE and it worked fine. Didn’t sound better than the 5814 12au7 variant I had in there though.
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cave Verified Member Offline Posts: 16	Re: General Support Question Reply #2 - 09/11/19 at 03:49:54 Yep probably safe to use, when I subbed those in for 12AU7's on a few preamps, they sounded OK at first, but over time they just didn't sound right.
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Re: General Support Question
Reply #3 - 09/11/19 at 13:42:03

I've tried about 7 different 12AU7 variants in my ZROCK2s (one with the full mods and the silver RCA jacks, one with just the silver RCA jacks and beeswax caps) and have decided that the one to use and keep using is the 5814a tube. Mark58 alerted me to this tube and I have an RCA backplate that I really like and an Amperex that is slightly different sounding and very good and I have been using both recently.

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Reptar Senior Member Offline Posts: 58	Re: General Support Question Reply #4 - 09/11/19 at 19:48:48 Thanks to all! I appreciate the help. Regards
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