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Cary Audio Design Superior Quality and Value

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  #4731  
Old 07-20-2018, 05:27 PM
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BearCityUSA BearCityUSA is online now
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Quote:
Originally Posted by FloridaBoy View Post
Just get a pair of the EML solid plates and .


Why not mesh plates. The pair will cost almost as much as the amp.
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  #4732  
Old 07-20-2018, 06:06 PM
Bombadil Bombadil is online now
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While KT150s can result in more power in amps specifically designed for them for maximum output power, I haven't seen anything from Dennis to suggest that is true when using them in one of his amps. He told me that my amp will produce 17 wpc when using KT88, KT120, or KT150.

Has anyone seen any claims by him for more output power when using KT150s in one of his newer designs?
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  #4733  
Old 07-20-2018, 09:33 PM
decooney decooney is online now
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Originally Posted by Bombadil View Post
While KT150s can result in more power in amps specifically designed for them for maximum output power, I haven't seen anything from Dennis to suggest that is true when using them in one of his amps. He told me that my amp will produce 17 wpc when using KT88, KT120, or KT150.

Has anyone seen any claims by him for more output power when using KT150s in one of his newer designs?
12wpc was the max I’ve ever seen hand documented by Dennis or for other Hot Rod amp references online. I actually like the SOUND of the KT150s in the Hot Rod in combo with my SLP-98 preamp using 50s Sylvania tubes.
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  #4734  
Old 07-20-2018, 11:07 PM
Bombadil Bombadil is online now
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He didn't make many of the 17 watt'ers. I suspect he sacrificed a bit of "Single-ended goodness" on the altar of deriving more power. There certainly is no triode mode available. Here is the text of his description of my amp when he listed it on eBay:

"FIRE-BOTTLE"
NEW HIGHER POWER
17 WATT PER CHANNEL
SINGLE-ENDED STEREO AMPLIFIER
KT-88/6550 TUBE
SINGLE-ENDED CLASS A

SPECIAL EDITION

"LATEST HO EDITION"

INSPIRE TUBE AMPLIFIER by DENNIS HAD FEATURING THE KT-88/6550 BEAM POWER VACCUM TUBE AMPLIFIER IN A SINGLE-ENDED CLASS A 17 WATT DESIGN

"INSPIRE FIRE-BOTTLE"

CLASS A, 17 WATT SE
KT-88 GENALEX OUTPUT TUBES
6SN7 INPUT DRIVER
5AR4, GZ-34 RECTIFIER TUBE
REGULATED OUTPUT KT-88 SCREEN GRID B+ VOLTAGE
REGULATED DC, B+ VOLTAGE ON DRIVER TUBE
REGULATED DC POSITIVE CATHODE BIAS ON DRIVER TUBE

INDIVIDUAL FILAMENT TRANSFORMERS FOR EACH OUTPUT TUBE

CUSTOM DESIGNED AIR-GAP 20 WATT OUTPUT TRANSFORMERS TO MATCH KT-88 TUBES AT FULL BANDWIDTH

I have designed and built in just about every special part but the kitchen sink in this new high output SE amplifier

Every Inspire amplifier and preamplifier is a new cool thing that never existed before today. I just love designing, building and sharing these single-ended class "A" amplifiers with music lovers in all corners of the world. After all these years I just love it!!!!!!!

This afternoon I am offering a special version of the original Fire-Bottle, powerful single-ended class A amplifier featuring the famous KT-88, 6550 output tubes. I gotta tell ya, the sonic presentation delivered by this amplifier will revitalize your musical enjoyment. You'll be listening to your record/music collection as if you were hearing the performers for the first time. This jewell delivers the emotion of the music ... big time. The amp plays like a 50 watter with amazing control and slam. I consider this a "life-time" amplifier.

If you have ever wondered about this single-ended vacuum tube audio craze ..... now is the time for an Inspire "Fire-Bottle" SE amplifier in your home listening room. No matter the choice of music you enjoy or the playback equipment you use, this affordable Inspire will reward the listener with the emotional impact and realism of the original score.

Thank you for your interest in the Inspire KT-88 HIGH POWER SPECIAL EDITION FIRE-BOTTLE offering and have a great day .........

Dennis J. Had W4USR Radioman731
retired Founder and President of Cary Audio Design

Last edited by Bombadil; 07-21-2018 at 01:09 AM.
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  #4735  
Old 07-21-2018, 01:30 AM
decooney decooney is online now
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Default Tubes, Watts, Limits, Sound

Speaking of "tubes" and "watts" and "sound", a response from Dennis about similar questions I had. It helped me to understand better, hope it helps others.

----------------------------------------------------------------------------------------

Good evening. I will compile a tube chart in a few days. I am running the Fire-Bottle monos in the pure class A triode SET mode. I am running 6550’s at the moment in a pair in my home at 15 watts per channel with 5U4 rectification. In the prototype stage I had these guys in the SEP pentode mode at 25 watts per mono. Give me a few days to get back to the mighty Fire-Bottle PSE monos and I will have a tube chart. I might mention that the mono’s running with a pair of 6F6G’s at 6 watts sound like a giant power house of SET power. It all boils down to driver control. I need to balance versatility and driver control to total power output. The first set of mono prototypes from a few months ago I was using a very low primary impedance output transformer for max power output. 19 watts triode with KT-150 PSE each mono but the sonic presentation was in your face … not a rich tube sound .. sounded more like solid state … so it takes a delicate balance. The sonic improvement with KT150 in PSE with the present transformers at 15 watts is smooth and controls the drivers well. Anyway ….. a few more days and more info. 5-15 watts will probably be the good balance for all tube rolling.Thank so much for continuing interest and I’ll talk to you soon. Dennis

----------------------------------------------------------------------------------------------
EDUCATION:
The education and updates from Dennis have been a valuable learning experience for me coming from high current solid state amplifiers I ran for 35 years and got into tube amplifier (late) just five years ago. With solid state, I progress over a few decades through variations of higher power / higher current amps 100w, 150w, 250wpc/75A stereo, dual mono and noticed quite a difference in driver control with the higher current amps. With tubes, the only things that seemed to translate over for me is the size of transformers. Otherwise, Tube amps appear to have their own set of rules and guidelines to stay within the "sweet spot" as I understand it better now thanks to Dennis. Interesting learning.

.
.

Last edited by decooney; 07-21-2018 at 09:35 AM.
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