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In Reply to: RE: A couple of tube questions posted by audiophilewannabe on April 13, 2020 at 14:16:00
I don't care who the designer is. The facts don't care who the designer is.
If it's a KT88 wired in triode mode it will not give you 8 watts. Period.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
not without some grid current...:)
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Yeah, that would help but the ad print doesn't say anything about a IT. Can a triode wired KT88 be properly driven by a 6H30 into A2 without an IT?
" QUICKSILVER SET MONO AMP
The Quicksilver single-ended amplifier uses no global feedback and yet offers lower distortion, wider frequency response and higher damping than standard single-ended designs. The parts list includes polypropylene and foil capacitors, non-inductive wirewound resistors, audio-core chokes and Quicksilver-designed power and output transformers.
As with all Quicksilver amplifiers, many different output tubes may be used. The power bandwidth extends to 20Hz and the 9 watts output has less than 1db of compression. Each output transformer is individually tested and categorized so that each pair of amps will have closely matched output characteristics. The amplifiers are finished in carbide black with nickel chrome transformer covers. The following specifications are provided for reference only. Sound quality performance can only be evaluated by direct comparison in your system.
Quicksilver SET Mono Amplifier Specifications
- Power output: 9 watts into 4 or 8 ohms
- Power bandwidth: 20Hz - 80kHz
- One-watt frequency response: 5Hz - 100kHz
- Damping factor: 8
- Hum and Noise: 90dB below 9 watts
- One-watt IM distortion: simple order 0.3%
- Global feedback: None
- Input sensitivity: 1.7 volts
- Input impedance: 300k ohms
- Power consumption: 140 watts
- Tube complement: 1-6H30 driver and input, 1-5AR4 rectifier, and 1-KT88 output tube
- Finish: Black chassis with chrome transformer covers
- Dimensions: 7"h x 14.5"d x 9.125"w
- Weight: 36 lbs., 39 lbs. shipping weight
- Warranty: 3 years parts and labor, tubes 90 days
"
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
So its name says 'SET'. And uses no global NFB. Its damping factor is 8, which suggests an output Z of 1R including the DCR of the OPT secondary.
9W is in between what you'd get in A1 triode, and what's available with UL and pentode. I have no trouble believing that they are taking descriptive liberties with their ad copy. It is just a matter of what exactly they are up to...LOL
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
"I have no trouble believing that they are taking descriptive liberties with their ad copy."
That makes two of us.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I can envision a circuit that would do well I think. A cascade of the 6H30 sections; first running open-loop, and the second getting plate-to-cathode FB from the final. Picture half( or one phase-worth) the RCA SP10 circuit, but swap the 6AU6 for a section of the 6H30 and adjust the resistor networks to deal with a proper OP and FB level.
I suspect it will sound pretty fine, especially given the SP10's performance. Best sounding off-the-rack amp I have heard so far.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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