Lots of great advice. I'll arrange a Mafia visit once the decorating is finished and I save up enough to buy in food for the day
Location: KY - Scotland
Posts: 5,470
I'm Mike.
Lots of great advice. I'll arrange a Mafia visit once the decorating is finished and I save up enough to buy in food for the day
Main System
Turntable: Heavily-modified Technics SL-1210MK5G [Mike New bearing/ETP platter/Paul Hynes SR7 PSU & reg mods]. Funk Firm APM Achromat/Nagaoka GL-601 Crystal Record Weight/Isonoe feet & boots/Ortofon RS-212D/Denon DL-103GL in Denon PCL-300 headshell with Funk Firm Houdini/Kondo SL-115 pure-silver cartridge leads.
Paul Hynes MC head amp/SR5 PSU. Also modded Lentek head amp/Denon AU-310 SUT.
Other Cartridges: Nippon Columbia (NOS 1987) Denon DL-103. USA-made Shure SC35C with NOS stylus. Goldring G820 with NOS stylus. Shure M55E with NOS stylus.
CD Player: Audiocom-modified Sony X-777ES/DAS-R1 DAC.
Tape Deck: Tandberg TCD 310, fully restored and recalibrated as new, by RDE, plus upgraded with heads from the TCD-420a. Also with matching TM4 Norway microphones.
Preamps: Heavily-modified Croft Charisma-X. LDR Stereo Coffee. Power Amps: Tube Distinctions Copper Amp fitted with Tungsol KT-150s. Quad 306.
Cables & Sundries: Mark Grant HDX1 interconnects and digital coaxial cable, plus Mark Grant 6mm UP-LCOFC Van Damme speaker cable. MCRU 'Ultimate' mains leads. Lehmann clone headphone amp with vintage Koss PRO-4AAA headphones.
Tube Distinctions digital noise filter. VPI HW16.5 record cleaning machine.
Speakers: Tannoy 15MGs in Lockwood cabinets with modified crossovers. 1967 Celestion Ditton 15.
Protect your HUMAN RIGHTS and REFUSE ANY *MANDATORY* VACCINE FOR COVID-19!
Also **SAY NO** to unjust 'vaccine passports' or certificates, which are totally incompatible with a FREE society!!!
Location: Troon
Posts: 2,476
I'm tony.
Mike,
PM sent....
IME, valve amp performance is 90%+ about the circuit & transformer design, and only a few % about the particular valves utilised. For instance, Radford and EAR both have (very different) designs that use EL34s, both giving results superior to the majority of 'bog-standard' KT88 amps. Similarly, the MacIntosh 275 uses a different circuit design to raise it's performance above the norm. for KT88 push-pull amps.
My Leben power amp has the facility to re-bias across a wide range of power valves (KT120, KT88, KT66, EL34, KT77, 6L6GC, 5881, 350B, etc), and although I haven't tried them all, there is a lot less difference than most people would imagine with the ones I have tried, the overall performance being overwhelmingly determined by the circuit topology and the o/p transformers. In fact, I suspect a blindfold test would show it'd be quite difficult to reliably, repeatedly, identify which valves were being used.
Indeed, but the chosen valves dictate (to a significant degree) the design of the circuit!
Therefore, one is intrinsically linked with the other...
No doubt, but do the same test with separate amplifiers, each one designed to optimise the characteristics of the chosen output valves (through circuit design and transformers used), and the results would be rather different....My Leben power amp has the facility to re-bias across a wide range of power valves (KT120, KT88, KT66, EL34, KT77, 6L6GC, 5881, 350B, etc), and although I haven't tried them all, there is a lot less difference than most people would imagine with the ones I have tried, the overall performance being overwhelmingly determined by the circuit topology and the o/p transformers. In fact, I suspect a blindfold test would show it'd be quite difficult to reliably, repeatedly, identify which valves were being used.
You'd need to be deaf not to hear the difference! There's a lot more to hearing the true capabilities of any output valve, KT88, EL34, or whatever, than merely re-biasing them in the same circuit... That's especially true, in the case of KT150s, because of their electrical demands.
I like KT88s/120s and 150s in P/P amps because I like a bit of power (at least 30w), because the added 'grunt' has a beneficial (and very valuable effect for me) on the music
Marco.
Main System
Turntable: Heavily-modified Technics SL-1210MK5G [Mike New bearing/ETP platter/Paul Hynes SR7 PSU & reg mods]. Funk Firm APM Achromat/Nagaoka GL-601 Crystal Record Weight/Isonoe feet & boots/Ortofon RS-212D/Denon DL-103GL in Denon PCL-300 headshell with Funk Firm Houdini/Kondo SL-115 pure-silver cartridge leads.
Paul Hynes MC head amp/SR5 PSU. Also modded Lentek head amp/Denon AU-310 SUT.
Other Cartridges: Nippon Columbia (NOS 1987) Denon DL-103. USA-made Shure SC35C with NOS stylus. Goldring G820 with NOS stylus. Shure M55E with NOS stylus.
CD Player: Audiocom-modified Sony X-777ES/DAS-R1 DAC.
Tape Deck: Tandberg TCD 310, fully restored and recalibrated as new, by RDE, plus upgraded with heads from the TCD-420a. Also with matching TM4 Norway microphones.
Preamps: Heavily-modified Croft Charisma-X. LDR Stereo Coffee. Power Amps: Tube Distinctions Copper Amp fitted with Tungsol KT-150s. Quad 306.
Cables & Sundries: Mark Grant HDX1 interconnects and digital coaxial cable, plus Mark Grant 6mm UP-LCOFC Van Damme speaker cable. MCRU 'Ultimate' mains leads. Lehmann clone headphone amp with vintage Koss PRO-4AAA headphones.
Tube Distinctions digital noise filter. VPI HW16.5 record cleaning machine.
Speakers: Tannoy 15MGs in Lockwood cabinets with modified crossovers. 1967 Celestion Ditton 15.
Protect your HUMAN RIGHTS and REFUSE ANY *MANDATORY* VACCINE FOR COVID-19!
Also **SAY NO** to unjust 'vaccine passports' or certificates, which are totally incompatible with a FREE society!!!
No, I don't think so. Take for example a standard push-pull output with grid bias - you could make that with any type of output valves. Same goes for push-pull with cathode bias, or for single-ended output. Pretty much any circuit type could be implemented with any type of valve.
True, there are some restrictions though. You can't make an ultra-linear output stage with triodes for example.
Anyway, I agree that getting the details right is more significant than the broad-brush view that a particular valve type has an inherent sound.
Yup, that's what I was referring to. Also, there's no doubt that if the circuit is designed to *optimise* the electrical parameters of a specific output valve, better results will be obtained than when that's not the case - as I've heard it for myself!
KT150s, for example, require certain types of output transformers (and the right circuit) to give of their best. The reality of the matter is contained in your last sentence: the devil is always in the details
Marco.
Main System
Turntable: Heavily-modified Technics SL-1210MK5G [Mike New bearing/ETP platter/Paul Hynes SR7 PSU & reg mods]. Funk Firm APM Achromat/Nagaoka GL-601 Crystal Record Weight/Isonoe feet & boots/Ortofon RS-212D/Denon DL-103GL in Denon PCL-300 headshell with Funk Firm Houdini/Kondo SL-115 pure-silver cartridge leads.
Paul Hynes MC head amp/SR5 PSU. Also modded Lentek head amp/Denon AU-310 SUT.
Other Cartridges: Nippon Columbia (NOS 1987) Denon DL-103. USA-made Shure SC35C with NOS stylus. Goldring G820 with NOS stylus. Shure M55E with NOS stylus.
CD Player: Audiocom-modified Sony X-777ES/DAS-R1 DAC.
Tape Deck: Tandberg TCD 310, fully restored and recalibrated as new, by RDE, plus upgraded with heads from the TCD-420a. Also with matching TM4 Norway microphones.
Preamps: Heavily-modified Croft Charisma-X. LDR Stereo Coffee. Power Amps: Tube Distinctions Copper Amp fitted with Tungsol KT-150s. Quad 306.
Cables & Sundries: Mark Grant HDX1 interconnects and digital coaxial cable, plus Mark Grant 6mm UP-LCOFC Van Damme speaker cable. MCRU 'Ultimate' mains leads. Lehmann clone headphone amp with vintage Koss PRO-4AAA headphones.
Tube Distinctions digital noise filter. VPI HW16.5 record cleaning machine.
Speakers: Tannoy 15MGs in Lockwood cabinets with modified crossovers. 1967 Celestion Ditton 15.
Protect your HUMAN RIGHTS and REFUSE ANY *MANDATORY* VACCINE FOR COVID-19!
Also **SAY NO** to unjust 'vaccine passports' or certificates, which are totally incompatible with a FREE society!!!
Location: Seaford UK
Posts: 1,861
I'm Dennis.
I muse this thread with both interest and a failure to understand it.
I have built many valve amps from the late 60s onwards, and have not used one since about '74. My feelings are that in general they have so many disadvantages that they have technically been surpassed by bipolar SS amps; inefficiency, aging changes, microphony, limited power availability, low damping factor, and at best slightly under 0.1% distortion, but I accept that a good transformer can make the deal, (Partridge), and that they look lovely.
So unless there is an obvious, or even and inference of better sound, I could not consider a valve amp now, and I am left in a quandary about what seems to be this great divergence of perception and taste.
I've even gone Icepower for God's sake - really against every instinct in me, especially when considering the poor reports on switching power supplies.
“Music has always been a matter of energy to me, a question of fuel. Sentimental people call it inspiration, but what they really mean is fuel. I have always needed fuel. I am a serious consumer. On some nights I still believe that a car with the gas needle on empty can run about fifty more miles if you have the right music very loud on the radio”
Hunter S Thompson
Well, Dennis, that's the problem with adopting an 'objectivist' approach to audio, and attempting to use numbers to determine sound quality... Thankfully, there's a lot more to making a piece of equipment sound good (with music) than measurements alone, which only ever tell part of the story.
And so when you're only in possession of part of the story, it's no wonder you fail to understand the full 'plot'...
Marco.
Main System
Turntable: Heavily-modified Technics SL-1210MK5G [Mike New bearing/ETP platter/Paul Hynes SR7 PSU & reg mods]. Funk Firm APM Achromat/Nagaoka GL-601 Crystal Record Weight/Isonoe feet & boots/Ortofon RS-212D/Denon DL-103GL in Denon PCL-300 headshell with Funk Firm Houdini/Kondo SL-115 pure-silver cartridge leads.
Paul Hynes MC head amp/SR5 PSU. Also modded Lentek head amp/Denon AU-310 SUT.
Other Cartridges: Nippon Columbia (NOS 1987) Denon DL-103. USA-made Shure SC35C with NOS stylus. Goldring G820 with NOS stylus. Shure M55E with NOS stylus.
CD Player: Audiocom-modified Sony X-777ES/DAS-R1 DAC.
Tape Deck: Tandberg TCD 310, fully restored and recalibrated as new, by RDE, plus upgraded with heads from the TCD-420a. Also with matching TM4 Norway microphones.
Preamps: Heavily-modified Croft Charisma-X. LDR Stereo Coffee. Power Amps: Tube Distinctions Copper Amp fitted with Tungsol KT-150s. Quad 306.
Cables & Sundries: Mark Grant HDX1 interconnects and digital coaxial cable, plus Mark Grant 6mm UP-LCOFC Van Damme speaker cable. MCRU 'Ultimate' mains leads. Lehmann clone headphone amp with vintage Koss PRO-4AAA headphones.
Tube Distinctions digital noise filter. VPI HW16.5 record cleaning machine.
Speakers: Tannoy 15MGs in Lockwood cabinets with modified crossovers. 1967 Celestion Ditton 15.
Protect your HUMAN RIGHTS and REFUSE ANY *MANDATORY* VACCINE FOR COVID-19!
Also **SAY NO** to unjust 'vaccine passports' or certificates, which are totally incompatible with a FREE society!!!