I have a MC275 where I mounted the Genalex Gold Lion KT88.
The value of Ip and Gm are respectively 65 and 8,100.

I checked the same valve, the higher the value of GM (transconductance), better the result!

What are the values of KT88 mounted on your MC275 and MC2301?

The valves on the market have the Gm values every time lower!

I'm sorry for my poor english!

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MASSIMO

I purchased 50 new gold lions and was only able to measure 4 tubes at 8800 to 9100. All the rest came in at 7500 to 8000 on my Hickok 539C. The 12ax7 and 12au7 measure very strong, waiting for the 12at7's with high expectations for my 275 and 2301.

Many thanks for your feedback.

When will be available the gold lion ECC81/B739?

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MASSIMO

Now -- should have a few early next week.

Bob

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Amps: MC2301 tube mono's/dedicated 20A breakers.
Preamp: C500C/C500T
Digital Source: MCD1100 CD/SACD
Analogue Sources: SME 20/2 w/SME V arm and Palo Santos Presentation Cartridge & Akai GX-400D Reel-to-Reel w/relapped heads by JRF Magnetic Sciences.
Vibration Control: Nordost "TC" Sort Kones under CD/SACD & C500 and "AC" under amps. Shakti stones on amps.
Speakers: Sonus Faber Stradivari
Power Isolation: Isoclean PT-3030G III 3KVA Isolation Transformer w/Isoclean Super Focus In/Out Cables.
Power Bar: Isoclean ICP 206 Non-Filtered Power Bar.
Power Cables: Wireworld Platinum Electra on amps, preamp, CD/SACD.
Power Outlets: Isoclean ICP-003 Power Wall Socket.
Speaker Cables: Wireworld Platinum Eclipse
Signal Cables: WireWorld Platinum Eclipse XLR's on MCD500 & C500T to MC2301's.
Headphones: Sennheiser HD-650's and Koss Pro IV AA.
Tube Test Gear: Mint late '60's/calibrated Heathkit TT-1A & current SOTA MaxiMatcher tube test sets.

Bob.......Waiting on your report before deciding to place an order.

__________________
Dan


Living Room System: McIntosh C2300, MC601 (2), MCD1100, MS750, MR85, Sony DAT 60ES, Nakamichi BX-300, Micro Seiki DD-40, Ortofon 2M Black, Sonos ZP90, Oppo BDP-83SE Blu-ray, PMC EB1i, Fathom f113 w/ Sound Anchor stand, Power Plant Premier (2), PS Audio Soloist Premier SE (3), Rollerblock Jr.'s, Wireworld Silver Eclipse IC's & PC's, Kimber 8TC with WBT Solid Silver Angled Locking Banana Connectors.
Studio System: McIntosh C1000C/P, MC2301 (2), MCD1100, MR88, Michell Gyro SE w/SME 309/Ortofon Cadenza Black, Sonos ZP90, PS Audio Power Plant Premier, PS Audio Soloist Premier SE, Sonus Faber Amati Anniversario, Rollerblock Jr.'s, Wireword Silver Eclipse IC's & PC's, Wireworld Silver Eclipse speaker cable.
Studio Home Theater System: McIntosh MX120, MC452, Oppo BDP-95 Blu-ray, PS Audio Soloist Premier SE, JBL LSR-6332 (2), JBL LSR-6328P (3), McIntosh XLS112 (2), Sony 52XBR9, Tributaries Silver IC's, Wireworld PC's.
Vintage: McIntosh MA5100, MR74 tuner, JVC XL-Z1050 K2 CD player, Wyred 4 Sound DAC2, Tandberg 3008A and 3026A, JBL4312A , McIntosh 4300V for deck speakers.

Roger that Dan -- really looking forward to trying these in the amps. I'm very happy with the 12AX7GENGP's in the C500T (MC side -- still haven't gotten to the line side yet--guess I qualify for laziness).

Bob

__________________
Amps: MC2301 tube mono's/dedicated 20A breakers.
Preamp: C500C/C500T
Digital Source: MCD1100 CD/SACD
Analogue Sources: SME 20/2 w/SME V arm and Palo Santos Presentation Cartridge & Akai GX-400D Reel-to-Reel w/relapped heads by JRF Magnetic Sciences.
Vibration Control: Nordost "TC" Sort Kones under CD/SACD & C500 and "AC" under amps. Shakti stones on amps.
Speakers: Sonus Faber Stradivari
Power Isolation: Isoclean PT-3030G III 3KVA Isolation Transformer w/Isoclean Super Focus In/Out Cables.
Power Bar: Isoclean ICP 206 Non-Filtered Power Bar.
Power Cables: Wireworld Platinum Electra on amps, preamp, CD/SACD.
Power Outlets: Isoclean ICP-003 Power Wall Socket.
Speaker Cables: Wireworld Platinum Eclipse
Signal Cables: WireWorld Platinum Eclipse XLR's on MCD500 & C500T to MC2301's.
Headphones: Sennheiser HD-650's and Koss Pro IV AA.
Tube Test Gear: Mint late '60's/calibrated Heathkit TT-1A & current SOTA MaxiMatcher tube test sets.

Bob.......Come on, get them installed on the porch. I'd be very interested in how they sound in your C500 line stage. If I buy any of the Gold Lion 12AX7's, that's where they will go first in my preamp.

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Dan


Living Room System: McIntosh C2300, MC601 (2), MCD1100, MS750, MR85, Sony DAT 60ES, Nakamichi BX-300, Micro Seiki DD-40, Ortofon 2M Black, Sonos ZP90, Oppo BDP-83SE Blu-ray, PMC EB1i, Fathom f113 w/ Sound Anchor stand, Power Plant Premier (2), PS Audio Soloist Premier SE (3), Rollerblock Jr.'s, Wireworld Silver Eclipse IC's & PC's, Kimber 8TC with WBT Solid Silver Angled Locking Banana Connectors.
Studio System: McIntosh C1000C/P, MC2301 (2), MCD1100, MR88, Michell Gyro SE w/SME 309/Ortofon Cadenza Black, Sonos ZP90, PS Audio Power Plant Premier, PS Audio Soloist Premier SE, Sonus Faber Amati Anniversario, Rollerblock Jr.'s, Wireword Silver Eclipse IC's & PC's, Wireworld Silver Eclipse speaker cable.
Studio Home Theater System: McIntosh MX120, MC452, Oppo BDP-95 Blu-ray, PS Audio Soloist Premier SE, JBL LSR-6332 (2), JBL LSR-6328P (3), McIntosh XLS112 (2), Sony 52XBR9, Tributaries Silver IC's, Wireworld PC's.
Vintage: McIntosh MA5100, MR74 tuner, JVC XL-Z1050 K2 CD player, Wyred 4 Sound DAC2, Tandberg 3008A and 3026A, JBL4312A , McIntosh 4300V for deck speakers.

"On the porch" means what, please?

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Quad ESL57s, MC2301s, MEN220, MCD301, PS Audio PPPs, Wireworld Silver Eclipse 5.2 interconnects and PCs on amps and LessLoss DFPC Originals PCs on all else, Symposium Roller Blocks on all electronics, Oyaide WPC-XXX/R1s, Auditorium 23 speaker cables.

Britt.......On the C500T and the C1000T preamps, the line stage tubes are in the window up front. The space behind the window is refered to as the front porch.

__________________
Dan


Living Room System: McIntosh C2300, MC601 (2), MCD1100, MS750, MR85, Sony DAT 60ES, Nakamichi BX-300, Micro Seiki DD-40, Ortofon 2M Black, Sonos ZP90, Oppo BDP-83SE Blu-ray, PMC EB1i, Fathom f113 w/ Sound Anchor stand, Power Plant Premier (2), PS Audio Soloist Premier SE (3), Rollerblock Jr.'s, Wireworld Silver Eclipse IC's & PC's, Kimber 8TC with WBT Solid Silver Angled Locking Banana Connectors.
Studio System: McIntosh C1000C/P, MC2301 (2), MCD1100, MR88, Michell Gyro SE w/SME 309/Ortofon Cadenza Black, Sonos ZP90, PS Audio Power Plant Premier, PS Audio Soloist Premier SE, Sonus Faber Amati Anniversario, Rollerblock Jr.'s, Wireword Silver Eclipse IC's & PC's, Wireworld Silver Eclipse speaker cable.
Studio Home Theater System: McIntosh MX120, MC452, Oppo BDP-95 Blu-ray, PS Audio Soloist Premier SE, JBL LSR-6332 (2), JBL LSR-6328P (3), McIntosh XLS112 (2), Sony 52XBR9, Tributaries Silver IC's, Wireworld PC's.
Vintage: McIntosh MA5100, MR74 tuner, JVC XL-Z1050 K2 CD player, Wyred 4 Sound DAC2, Tandberg 3008A and 3026A, JBL4312A , McIntosh 4300V for deck speakers.

Thanks for the clarification. That's funny. Makes sense to me now.

In the back of my mind, I had always thought it would be cool if McIntosh would design a preamp, or a plug in of sorts, the way the C500T and C1000T have separate boxes, that would allow for the switching of multiple sets of tubes with a switch rather than having to open the preamp up, remove the cover and roll tubes like that. It would be cool to be able to switch between different choices in the line stage.

__________________
Quad ESL57s, MC2301s, MEN220, MCD301, PS Audio PPPs, Wireworld Silver Eclipse 5.2 interconnects and PCs on amps and LessLoss DFPC Originals PCs on all else, Symposium Roller Blocks on all electronics, Oyaide WPC-XXX/R1s, Auditorium 23 speaker cables.