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Thread: 6J1 Pre-amp modifications (hum removal)

  1. #31
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 2,725
    I'm Oliver.

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    Quote Originally Posted by Firebottle View Post
    Well I'm afraid this might not be what folk want to hear. The buffer is SO neutral that I cannot tell a difference with it being in circuit or not.

    I have tried a couple of lower ranking CD players, Philips CD-610-II and CD-713.
    Oh 🤔 daft question, are you running in your Firebottle gear ?

    Sent from my EVA-L09 using Tapatalk
    Alphason HR100 MCS > Toshiba SR 370 Turntable > ZYX R50 Bloom cartridge > Firebottle OTP MK2 Phono Stage > Firebottle Monoblocks > Creek OBH-11SE Headphone Amp > IXOS Speaker Cables > Pioneer CS-77A Speakers

  2. #32
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 3,532
    I'm Alan.

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    Yes Oliver, the rest of the system is very neutral/transparent.

    I've tried the buffer with the Firebottle phono section and the aforementioned CDP's as input, feeding either the line stage of the KIN then Monoblocks, or the latest EL84 SE amp then into the ESL57's.

    All sounds rather spiffing old chap

  3. #33
    Join Date: Jan 2017

    Location: Kansas City, Missouri

    Posts: 590
    I'm Nathan.

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    If you have a CD player that you don't care about you can take out the output transistors, and use that to bump it back up to line level. That's how I usually do it. I've never heard much difference unless you add a little gain.

  4. #34
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 34,586
    I'm Grant.

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    Mine uses the mu-vista 6112 tubes and its impedences are 470k Ohm input, and 33 Ohm output if thats any help. Certainly adds a touch of life to some things
    Regards,
    Grant ....
    Sometimes incompetence is useful. It helps you keep an open mind.
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    IMUTO TAURUS X4 BATTERY SUPPLY. - RPI2B & AUDIOPHONICS DAC running MOODE 3.7- TONBRUX BATTERY SUPPLY & CHROMECAST2 AUDIO DONGLE no1 - JBE SERIES 3 SLATEDECK & EMOTIVA XPS-1 PHONO - DENON DV2900 - TWIN PRO MONOBLOCK AMPLIFIERS. - XIANG SHENG DAC\PRE\HEADPHONE AMP. -AUDIO TECHNICA ATH-MSR7 & OPPO PM-3 PLANAR HEADPHONES - WIN10 JRIVER22, SPOTIFY PREMIUM- KINPS CABLES, SMSL M6 MINIDAC, CHROMECAST2 AUDIO DONGLE no2 POWERED BY ANKER BATTERY PSU - FULL RANGE TWIN & SINGLE TELEFUNKEN's - Q ACOUSTIC BT3 actives - CANTON SUB - TANDBERG TCD310 CASS - CARTS.. ACD xlm mk1 integra, AT95SA Shibata, SHURE N55 SAS, SHURE M55E original, JVC MD1029. - RCA CABLES BY BRIAN SPKR CABLES BY MOI HAIR BY MARCO FEET BY ELECTRICBEACH - MAINS REGENERATED BY POWERINSPIRED AND FILTERED BY BELKIN PUREAV.

  5. #35
    Join Date: Jan 2017

    Location: Kansas City, Missouri

    Posts: 590
    I'm Nathan.

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    Mine is made from parts scavenged out of the mic preamp from an Ampex 960. It's not technically a buffer. I don't remember the impedences. I'll have to pull it out of the CD player and check it.

  6. #36
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 2,725
    I'm Oliver.

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    Quote Originally Posted by Firebottle View Post
    Yes Oliver, the rest of the system is very neutral/transparent.

    I've tried the buffer with the Firebottle phono section and the aforementioned CDP's as input, feeding either the line stage of the KIN then Monoblocks, or the latest EL84 SE amp then into the ESL57's.

    All sounds rather spiffing old chap
    Oooo exciting!!!!

    Sent from my EVA-L09 using Tapatalk
    Alphason HR100 MCS > Toshiba SR 370 Turntable > ZYX R50 Bloom cartridge > Firebottle OTP MK2 Phono Stage > Firebottle Monoblocks > Creek OBH-11SE Headphone Amp > IXOS Speaker Cables > Pioneer CS-77A Speakers

  7. #37
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 2,725
    I'm Oliver.

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    Quote Originally Posted by Firebottle View Post
    Yes Oliver, the rest of the system is very neutral/transparent.

    I've tried the buffer with the Firebottle phono section and the aforementioned CDP's as input, feeding either the line stage of the KIN then Monoblocks, or the latest EL84 SE amp then into the ESL57's.

    All sounds rather spiffing old chap
    Would you notice the effect as much if its it already on a valve based system ?

    Sent from my EVA-L09 using Tapatalk
    Alphason HR100 MCS > Toshiba SR 370 Turntable > ZYX R50 Bloom cartridge > Firebottle OTP MK2 Phono Stage > Firebottle Monoblocks > Creek OBH-11SE Headphone Amp > IXOS Speaker Cables > Pioneer CS-77A Speakers

  8. #38
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 34,586
    I'm Grant.

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    probably more noticable between valve pre and ss power
    Regards,
    Grant ....
    Sometimes incompetence is useful. It helps you keep an open mind.
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    IMUTO TAURUS X4 BATTERY SUPPLY. - RPI2B & AUDIOPHONICS DAC running MOODE 3.7- TONBRUX BATTERY SUPPLY & CHROMECAST2 AUDIO DONGLE no1 - JBE SERIES 3 SLATEDECK & EMOTIVA XPS-1 PHONO - DENON DV2900 - TWIN PRO MONOBLOCK AMPLIFIERS. - XIANG SHENG DAC\PRE\HEADPHONE AMP. -AUDIO TECHNICA ATH-MSR7 & OPPO PM-3 PLANAR HEADPHONES - WIN10 JRIVER22, SPOTIFY PREMIUM- KINPS CABLES, SMSL M6 MINIDAC, CHROMECAST2 AUDIO DONGLE no2 POWERED BY ANKER BATTERY PSU - FULL RANGE TWIN & SINGLE TELEFUNKEN's - Q ACOUSTIC BT3 actives - CANTON SUB - TANDBERG TCD310 CASS - CARTS.. ACD xlm mk1 integra, AT95SA Shibata, SHURE N55 SAS, SHURE M55E original, JVC MD1029. - RCA CABLES BY BRIAN SPKR CABLES BY MOI HAIR BY MARCO FEET BY ELECTRICBEACH - MAINS REGENERATED BY POWERINSPIRED AND FILTERED BY BELKIN PUREAV.

  9. #39
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 2,725
    I'm Oliver.

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    Quote Originally Posted by struth View Post
    probably more noticable between valve pre and ss power
    I was thinking that. In the signal path of a CDP to SS AMP would show its effects more so.

    Sent from my EVA-L09 using Tapatalk
    Alphason HR100 MCS > Toshiba SR 370 Turntable > ZYX R50 Bloom cartridge > Firebottle OTP MK2 Phono Stage > Firebottle Monoblocks > Creek OBH-11SE Headphone Amp > IXOS Speaker Cables > Pioneer CS-77A Speakers

  10. #40
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 2,725
    I'm Oliver.

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    Good thing is it isn't having a detrimental effect on Alan's gear

    Sent from my EVA-L09 using Tapatalk
    Alphason HR100 MCS > Toshiba SR 370 Turntable > ZYX R50 Bloom cartridge > Firebottle OTP MK2 Phono Stage > Firebottle Monoblocks > Creek OBH-11SE Headphone Amp > IXOS Speaker Cables > Pioneer CS-77A Speakers

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