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Thread: Rebuilding and modifying my Lentek head amp

  1. #1
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

    Posts: 102,098
    I'm AudioAl'sArbiterForPISHANTO.

    Thumbs up Rebuilding and modifying my Lentek head amp

    So... My Lentek MC head amp had gone noisy on one channel, making a 'rustling' sound (a common fault with these units when the carbon resistors go bad).

    Therefore, rather than wasting time tracing the fault to a specific resistor, I decided to revamp the PCB and upgrade all the existing resistors for Audionote Tantalum and Charcroft Z-Foils, with the latter fitted in the most crucial parts of the circuit, as from experience I know how both sound, and the Z-Foils impart a lovely 'sparkly clarity' to the top-end.

    I decided to keep the Tants as caps (the blue ones, shown below), but replace them with new ones of the same value [being as the originals would be over 30 years old], as I like how they sound, and also retain the original output devices. The unit had already been fitted with Cardas Litz output cables and KLE Silver Harmony 'bullet' phono plugs, plus solid-copper (low-mass) Eichmann connectors. That was the first upgrade I did, which made a big difference.

    So, here is the before:



    And now the after pics, including after it had been tested on a scope:




















    All work was carried out by Anthony Matthews of Tube Distinctions. Can't wait to get it back and hear how it sounds, so full report to follow!

    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.

    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 HW18.5 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!

  2. #2
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

    Posts: 102,098
    I'm AudioAl'sArbiterForPISHANTO.

    Default

    Hello... IS THERE ANYONE AT HOME?

    Thought modding Lenteks was popular around here! Any comments on what I've done?

    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.

    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 HW18.5 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!

  3. #3
    Join Date: Jul 2020

    Location: Calvados, France

    Posts: 12
    I'm Adrian.

    Default

    Attention seeker seeks attention...

  4. #4
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

    Posts: 102,098
    I'm AudioAl'sArbiterForPISHANTO.

    Default

    Is that supposed to be funny - do you want banned for your cheek?

    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.

    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 HW18.5 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!

  5. #5
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 73,479
    I'm Grant.

    Default

    department head
    Regards,
    Grant .... ؠ

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    OPPO BDP-103D - PANASONIC UB450 - IFI PURIFIER 2/PATHOS CLASSIC REMIX & HIDAC AMPLIFIER - LEAF HD BLUETOOTH - NURAPHONE' HEADPHONES - 2*ZBOOK'- ROON - MULTI HDD'S - DIGIONE RPI3 - EDINGDALE MK1 SPEAKERS - CABLE INC SUPRA, FISUAL, MOGAMI,

    **Ive studied deeply in the philosophies and religions, but cheerfulness kept breaking through**

    "An old man sleeps with his conscience at night, while young kids sleep with their dreams"

    "Justice is sinking to the bottom of the sea, And it feels like I'm living in the wasteland of the free"

    It was the weakest practical joke since Cardinal Wolsey got his nob out at Hampton Court and stood at the end of the passage pretending to be a door!

    I like my whisky old and my women young. Errol Flynn

    ***SMILE, BE HAPPY***

  6. #6
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

    Posts: 102,098
    I'm AudioAl'sArbiterForPISHANTO.

    Default

    Sorry mate, don't get what you mean?

    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.

    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 HW18.5 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!

  7. #7
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 73,479
    I'm Grant.

    Default

    calvados is a dept. he is the village idiot according to his user name
    Regards,
    Grant .... ؠ

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    OPPO BDP-103D - PANASONIC UB450 - IFI PURIFIER 2/PATHOS CLASSIC REMIX & HIDAC AMPLIFIER - LEAF HD BLUETOOTH - NURAPHONE' HEADPHONES - 2*ZBOOK'- ROON - MULTI HDD'S - DIGIONE RPI3 - EDINGDALE MK1 SPEAKERS - CABLE INC SUPRA, FISUAL, MOGAMI,

    **Ive studied deeply in the philosophies and religions, but cheerfulness kept breaking through**

    "An old man sleeps with his conscience at night, while young kids sleep with their dreams"

    "Justice is sinking to the bottom of the sea, And it feels like I'm living in the wasteland of the free"

    It was the weakest practical joke since Cardinal Wolsey got his nob out at Hampton Court and stood at the end of the passage pretending to be a door!

    I like my whisky old and my women young. Errol Flynn

    ***SMILE, BE HAPPY***

  8. #8
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

    Posts: 102,098
    I'm AudioAl'sArbiterForPISHANTO.

    Default

    He'll be a banned village idiot if he doesn't apologise and promise not to address me like that again.

    So idiot-boy, you've got until 6.30pm to do so, otherwise you're a gonner.. Comprende?

    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.

    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 HW18.5 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!

  9. #9
    Join Date: Jul 2020

    Location: Calvados, France

    Posts: 12
    I'm Adrian.

    Default

    If the cap fits...

  10. #10
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 73,479
    I'm Grant.

    Default

    interesting ip of manchester, considering your supposedly in france
    Regards,
    Grant .... ؠ

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    OPPO BDP-103D - PANASONIC UB450 - IFI PURIFIER 2/PATHOS CLASSIC REMIX & HIDAC AMPLIFIER - LEAF HD BLUETOOTH - NURAPHONE' HEADPHONES - 2*ZBOOK'- ROON - MULTI HDD'S - DIGIONE RPI3 - EDINGDALE MK1 SPEAKERS - CABLE INC SUPRA, FISUAL, MOGAMI,

    **Ive studied deeply in the philosophies and religions, but cheerfulness kept breaking through**

    "An old man sleeps with his conscience at night, while young kids sleep with their dreams"

    "Justice is sinking to the bottom of the sea, And it feels like I'm living in the wasteland of the free"

    It was the weakest practical joke since Cardinal Wolsey got his nob out at Hampton Court and stood at the end of the passage pretending to be a door!

    I like my whisky old and my women young. Errol Flynn

    ***SMILE, BE HAPPY***

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