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rolling rolling rolling, keep them tubes a rolling

mike5500

mike5500

Active Member
Hey folks....I've been playing around with different tube configurations in my MC 30s. Currently, I have a set of matched Black Can RCA 6l6s dated 9/60 not quite as warm as the 5881s I had been using but they're still breaking in , 5U4 rectifiers and 5751 pre amp tubes. Anybody know of a good replacement for the 12BH6s in an MC30?

Thanks in advance,
Mike
 
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I think you are talking about the 12bh7 tubes? If so RCA black plates from the 50s-60s are the holy grail. RCA grey plates are much more affordable and available. The grey plates sound sweet in my Mc-225s.
You may want to consider tube rolling the front end input tubes. I'm not familiar with the Mc-30 but their must be a 12ax7 or 12au7 in the mix? These will give you the best bang for sound ratio when tube rolling.
 
I am using RCA BP 12BH7s in mine. I had to collect a whole bunch of different tubes before I came up with a decent pair. Here's what I have in mine. I hear the 12AU7 to get is an Amperex gold pin or bugle boys. No luck for me yet.
12AX7- Telefunken
12AU7- RCA clear top
12BH7- RCA Black Plate
12AX7- Telefunken
5881- Tung Sol brown base
5U4GB-RCA tried some 5u4g but they made a weird noise.
 
sloober said:
I am using RCA BP 12BH7s in mine. I had to collect a whole bunch of different tubes before I came up with a decent pair. Here's what I have in mine. I hear the 12AU7 to get is an Amperex gold pin or bugle boys. No luck for me yet.
12AX7- Telefunken
12AU7- RCA clear top
12BH7- RCA Black Plate
12AX7- Telefunken
5881- Tung Sol brown base
5U4GB-RCA tried some 5u4g but they made a weird noise.
Click to expand...

Those RCA clear top 12AU7 are sweet tubes. I prefer them to the Amperex BB
A little more lively better bass The BB are more 3D sounding so really depends on you're looking for
 
So far I like the RCA clear tops. Also tried some JAN 5814 Sylvania as well and they were good. I have a less than optimal listening set up now, but it seems most anything I throw in these amps sounds fantastic. John
 
I kept the sylvania 12au7 but the 5751s replaced the 12ax7s...the metal can 6l6s replaced a set of GE 5881s and they're starting to sound a bit warmer now that they have about 20 hrs on them
 
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