Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: tubenit on October 20, 2014, 08:07:03 pm

Title: Carolina Blues Special (update)
Post by: tubenit on October 20, 2014, 08:07:03 pm

Still one of my favorite amps!  Sort of like a clean/more headroom version of 5E3, IMO.

I built this for a close friend some years ago and every few years have "borrowed" it to give it a check up. I'll have to say that I feel like I
"got it right" on this amp yrs ago.  It has some unique features with a Dano tone stack and the one tube reverb with a concertina phase invertor.  This time I changed the master volume to be a LarMar PPIMV. 

It sounds really really great to me!  Just a very fun amp to play.  The cab is pretty small. It's the one on the left in the photo. It sports a
Emminence Ragin Cajun speaker.  The reverb works fine for me and I like it set on somewhere between "3-5" on this amp.  Subtle, but you can sure hear it. 

The original thread in the ExpressSCH Library disappeared for some reason, so I thought I'd mention the amp again since it's been awhile since I really talked about it.  This could be a candidate for one of Doug's new chassis.

With respect, Tubenit

Title: Re: Carolina Blues Special (update)
Post by: shooter on October 20, 2014, 08:36:04 pm

Nice wood, I can see why you had to borrow it back.  I'm gonna mod my last hybrid build, adding a tube 2nd channel, preamp is in, just playing with PA choices and Preamp tweaks.  I've been thinking a 5e3ish tone for that channel, channel 1 is way clean, BUT, a tube clean channel might be good, borrowed your schematic, thx!

Title: Re: Carolina Blues Special (update)
Post by: Mike_J on October 21, 2014, 07:17:39 am

Those cabinets are a work of art.  If I made them they would go in the living room and never move for fear of scratching them.

Title: Re: Carolina Blues Special (update)
Post by: lego4040 on October 25, 2014, 07:40:26 am

 :worthy1: Holy Smoke!!!!!! Those are Insane.  Youll need to put a 5' barrier around them when using

Title: Re: Carolina Blues Special (update)
Post by: HotBluePlates on October 25, 2014, 08:25:14 am

All of Tubenit's amps are like that. He's an excellent woodworker (and the amps sound mighty fine, too)!

I was fortunate that he agreed to help with my Standel 25L15  (http://el34world.com/Forum/index.php?topic=14263.0)build by making a custom cabinet for me. It turned out great!

Title: Re: Carolina Blues Special (update)
Post by: Ken Moon on October 28, 2014, 03:10:00 pm

Much respect  :headbang:

Quick question - why are the power tubes biased so cold?

With a B+ of 409V, wouldn't 250-300 ohms be the typical values here?