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Music Man HD One Fifty

 
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unbridled



Joined: 09 May 2009
Posts: 48
Location: Montana

PostPosted: Mon Apr 27, 2015 11:19 pm    Post subject: Music Man HD One Fifty Reply with quote

I have an HD One Fifty and love it. It's about time to replace the 6L6s. What does everyone like?

I prefer warm and punchy, not brittle.
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Silverface



Joined: 23 Aug 2006
Posts: 324
Location: Hermosa Beach CA

PostPosted: Sun May 01, 2016 8:53 pm    Post subject: Reply with quote

Are you sure they are 6L6's? Most HD130's use EL34's, and they are NOT interchangeable.

If it's been converted to 6L6's or is one of the earlier 6L6 models definitely get hold of Mike at KCA at NOS tubes or Lord Valve on Colorado. Those amps slam the power tubes with extremely high plate voltages and problem #1 is finding tubes that will handle the voltages. I've had several of those amps and have worked on others and know of no current-production tubes I could recommend - they'd be firecrackers.

The second problem - "warm and punchy, not brittle" is not the inherent tone of these amps, which have heavy treble bite and very scooped mids. Listen to Clapton's '70's tone vs his newer tone for comparison - he used MM's in the 70's.

So you first need to find tubes that will hold up - THEN ones that can be biased hot enough to warm up the sound without blowing them up.

This is one problem that is reflected in the relatively low resale prices of MM amps. OK as clean/twang machines, but not warm, punchy, bluesy amps except for some of the VERY earliest ones with all-tube preamps. If it has only one small preamp-like tube it's only a phase inverter and the amp has a solid-state preamp.

Last point - tubes that will hold up and sound decent are not going to be cheap!
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unbridled



Joined: 09 May 2009
Posts: 48
Location: Montana

PostPosted: Thu Jun 02, 2016 11:28 pm    Post subject: Reply with quote

Thanks for the reply. It uses 6L6GCs. I retubed and biased it about 5 years ago, but, after your reply, I had to go look at the tag inside, just to be sure I wasn't crazy. It's my understanding the HD130s and HD150s use different tubes.

I use it mostly for bass, which is why I described my needs as warm. Now that I think of it, though, I really should use it more with guitar. I used to take the preamp output of my Princeton Chorus, run it into the 150, and then I had speaker jumper wires on the speakers in the Chorus. As long as I kept a check on the level, it sounded great. I did this because I like the reverb and channel switching of the Chorus, but the 150 warmed it up some.
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