Bottlehead Kits > MonAmour

6SN7 sub for 5670 in Monamours

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Paul Joppa:

--- Quote from: johnsonad on October 12, 2023, 01:31:36 AM ---You know what's funny, I had the exact same experience with Model 19's.  I preferred the 6SN7  to the 5670 with that speaker.  With my current speakers, the 5670 is the clear winner to my ears.  It's nice to have more than one choice.

--- End quote ---
Now this is getting interesting! Would you describe your current speaker?

I have new 2A3 amplifiers (PB built them for me) with 6J5 drivers. They are still breaking in, but I think I like them so far, compared to my Paramounts. My speakers use JBL 15" woofers and horn tweeters, crossed at 800Hz - similar to the Altec Model 19 in that way.

Altecboy:
Hello Aaron.  Which 6sn7's did you like the best?  I have tested NOS RCA, Sylvania.  And recent mfr. Sovtek, EH.  I like the RCA the best.  I needed to turn up the HF horns a bit for best balance. 

Larpy:

--- Quote from: Paul Birkeland on October 11, 2023, 10:48:01 AM ---The 6SN7 does have less gain, but that's not a limit to voltage swing.  The limit of voltage swing has to be analyzed in terms of the 6SN7 operating point and loadline.  I don't see any reason why you couldn't swing 250V RMS with a 6SN7, but you'd have to put a ton of signal into the grid to do that (15-ish volts at least), and that ends up being the issue.  In a modern HiFi system, there's generally such a ridiculous abundance of gain that having a power amp that's super insensitive may end up being a blessing at the end of the day, though we would tend to avoid selling one setup like that.

--- End quote ---

So would 6SN7s work as drivers in the Kaiju?  Using an adaptor without other modifications?

Paul Joppa:

--- Quote from: Larpy on October 15, 2023, 08:02:32 AM ---So would 6SN7s work as drivers in the Kaiju?  Using an adaptor without other modifications?

--- End quote ---
Yes. You would need to adjust the driver plate voltage, of course, but it should be within the available range of the trim pot.

johnsonad:

--- Quote from: Altecboy on October 14, 2023, 11:49:15 PM ---Hello Aaron.  Which 6sn7's did you like the best?  I have tested NOS RCA, Sylvania.  And recent mfr. Sovtek, EH.  I like the RCA the best.  I needed to turn up the HF horns a bit for best balance.

--- End quote ---

What matters is what sounds best to your ears in your system.  With the 19’s I rolled a lot of different tubes and found something that worked for me at that time.  I moved houses and rolled tubes again as the room changed what frequencies were heightened and canceled. In short, tube rolling is based on the individual’s experience. What sounds good in your system might not sound great in mine.

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