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-   -   Dennis Had Inspire Amps (https://www.audioaficionado.org/showthread.php?t=24170)

david45 01-26-2022 07:38 AM

Quote:

Originally Posted by nhparrot (Post 1052122)
Output Tube - Rectifier Tube
6L6, 5881, or KT66 - 5AR4, 5U4, or 274B
6V6 - 5Y3, or 6106
6V6GT - 5U4, 274B, 5Y3, or 6106
EL34, 6CA7, or KT77 - 5AR4, 5U4, or 274B
6550, KT88, KT90, KT120, or KT150 - 5AR4, 5U4, or 274B

Input Tubes
6BX7 - Has a deeper sound stage with more weight in the lower mids.
6SN7 - Has more gain than the 6BX7 with lower midrange heft
6SL7 - Has more gain than the 6SN7 and sparkle in the top end

For my 6L6 Firebottle (SEP) built in January 2015 output was tested by Dennis as:
Output Tube - Power
6L6, 5881, or KT66 - 8 to 10 watts
6V6 - 6 to 8 watts
EL34, 6CA7, or KT77 - 8 to 10 watts
6550, KT88, KT90, KT120, or KT150 - 9 to 14 watts

6BX7GT as input tube perhaps? Should I give it a try and order some?

nhparrot 01-26-2022 11:10 AM

Quote:

Originally Posted by david45 (Post 1054039)
6BX7GT as input tube perhaps? Should I give it a try and order some?

Worth a try to see if you like them. I have a couple for sale in the Selling forum

https://www.audioaficionado.org/showthread.php?t=50597

david45 01-26-2022 02:51 PM

Quote:

Originally Posted by nhparrot (Post 1054044)
Worth a try to see if you like them. I have a couple for sale in the Selling forum

https://www.audioaficionado.org/showthread.php?t=50597

Thank you for the reply. Unfortunately my user account doesn’t give me access to the marketplace/selling forum.

Are they similar in sound signature when compared to regular 6BX7?

nhparrot 01-26-2022 06:38 PM

2 Attachment(s)
Quote:

Originally Posted by david45 (Post 1054063)
Thank you for the reply. Unfortunately my user account doesn’t give me access to the marketplace/selling forum.

Are they similar in sound signature when compared to regular 6BX7?

As far as I know the only two types are a 6BX7GT and a 6BX7 with a coin base ( see images). I tried a few and prefer 6SL7 or 6SN7 in my Inspire amp.

Isaacc7 01-26-2022 10:58 PM

Quote:

Originally Posted by david45 (Post 1054039)
6BX7GT as input tube perhaps? Should I give it a try and order some?

I really like the 6bx7 paired with the El38 tubes. I have an RCA 6bx7. Think the el38 is the highest gain output tube out there, or at least its in the running. Makes sense that the lowest gain input tube would match up well I guess.

Bombadil 01-27-2022 12:09 AM

Quote:

Originally Posted by nhparrot (Post 1054081)
As far as I know the only two types are a 6BX7GT and a 6BX7 with a coin base ( see images). I tried a few and prefer 6SL7 or 6SN7 in my Inspire amp.

I tried a RCA 6BX7GT for about 10-15 minutes, just one time. Didn't like it at all. Never tried it again.

Analog Addict 01-27-2022 03:59 PM

The Blue Racer...
 
Went by the Toy Shop yesterday for a listening and brainstorming session, and found that Dennis hadn't been sitting around on his laurels. He showed off a new amp he's calling the Blue Racer, that runs everything from 6F6s to KT 170s. It's set up in single ended pentode and has a wonderful dynamic yet detailed sound to it. Most all of these toobs sounded good in it, but the KT 170's threw the biggest soundstage.

Some pix...

https://live.staticflickr.com/65535/...c8af5121_b.jpgUntitled by analog addict, on Flickr


https://live.staticflickr.com/65535/...1a248608_b.jpgUntitled by analog addict, on Flickr


6L6 GAYs labeled Mullard, but undoubtedly really Sylvanias....

https://live.staticflickr.com/65535/...48bda33e_b.jpgUntitled by analog addict, on Flickr

Some new KT 88s Dennis really likes...

https://live.staticflickr.com/65535/...ce3ee41f_b.jpgUntitled by analog addict, on Flickr

With this array of tubes in it, it looks like a Shanghai skyline....Sounds great though. Rectifier is a new WE 274 I believe....

https://live.staticflickr.com/65535/...8b1e9bc2_b.jpgUntitled by analog addict, on Flickr

Isaacc7 01-28-2022 11:50 AM

Looks good. Wonder how it differs from the current KT88 Firebottle. Is it capable of more power with the big tubes?

DRHamp 01-29-2022 08:52 AM

Quote:

Originally Posted by Isaacc7 (Post 1054182)
Looks good. Wonder how it differs from the current KT88 Firebottle. Is it capable of more power with the big tubes?

Good question - I thought the KT88 SEP would run all those tubes??

bearcity 01-29-2022 01:08 PM

Quote:

Originally Posted by DRHamp (Post 1054251)
Good question - I thought the KT88 SEP would run all those tubes??



My understanding of his designs, (I own 4), is that, though allowing for many tube combinations, electronically they are often optimized for a particular tube or range of tubes. KT88, 6V6er,… obvious. 6FLV for 6F6, 6L6, 6V6. A while back he had the Universal SET design as just what it’s name implies. Maybe this Blue Racer is an SEP version of that. The PT is quite small in comparison to the KT88 amp and OPTs look to be of similar size. I doubt the design is geared toward trying to maximize power output. Not really Dennis’s thing.


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