Hafler 500 Upgrade

Last night I upgraded the driver boards on my Hafler DH-500 to Musical Concepts PA-6 Elite.
Powered it up, set the bias and DC offset. All good!
I plan to put it back in the rack tonight and start the burn in process.
These boards are supposed to be quite an improvement as they are more transparent without adding brightness or etching.
We shall see... :)

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Mojo Audio Joule v5>>Quantum Byte w/JRiver 21 and Fidelizer>> Starlight 7 USB >> Marantz SA 8005>> Equinox 7>>
Hafler DH-110 Preamp + (Musical Concepts LXII Elite Mod) >>Equinox 7>>
Hafler DH-500 Amp+ (Musical Concepts PA-6 Elite Mod) >>Belden 5000 10 ga cables>>
SRS 2.3TL (Fully Modified)...SDA-1A (Fully Modified with Dimensional Tweeter Delete)
1KVA Dreadnought
Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
Yamaha TX-540 Tuner...Sony BDP-S570

Separate subpanel with four dedicated 20 amp circuits.
1. Amplification 2. Analog 3. Digital 4. Video

"All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"

Comments

  • motorhead43026motorhead43026 Posts: 2,221
    I am wanting to have this done to my XL600. Looking forward to your review.


    2 channel: Anthem 225 Integrated amp; Parasound Ztuner; TechnicsTT SL1350; Vincent PHO-8 phono pre; Marantz CD6005 spinner; Polk Signature S60's
    Cables: Wireworld Eclipse IC, Audio Art IC3; Speaker cable LA International SS-800; PS Audio AC-3 power cords; All into a PS Audio Dectet Power center.

    All TV's sound enhanced by Polk Magnfi Mini's.

    Other; SDA2BTL's, M10 series II, M7C's, Hafler XL600 amp, RB-980BX, Parasound HCA-1500 amp , P5 preamp, all in storage.
  • machonemachone Posts: 836
    I was not expecting much the first night I turned it on but wow.
    Silent background and huge soundfield with effortless power.
    Got the radio playing continuously to help burn in.
    :)
    Mojo Audio Joule v5>>Quantum Byte w/JRiver 21 and Fidelizer>> Starlight 7 USB >> Marantz SA 8005>> Equinox 7>>
    Hafler DH-110 Preamp + (Musical Concepts LXII Elite Mod) >>Equinox 7>>
    Hafler DH-500 Amp+ (Musical Concepts PA-6 Elite Mod) >>Belden 5000 10 ga cables>>
    SRS 2.3TL (Fully Modified)...SDA-1A (Fully Modified with Dimensional Tweeter Delete)
    1KVA Dreadnought
    Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
    Yamaha TX-540 Tuner...Sony BDP-S570

    Separate subpanel with four dedicated 20 amp circuits.
    1. Amplification 2. Analog 3. Digital 4. Video

    "All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"
  • SCompRacerSCompRacer Posts: 6,595
    Nice work! Long live DIY!
    Make yourself necessary to someone. Ralph Waldo Emerson

    Salk SoundScape 8's * Audio Research Reference 3 * Bottlehead Eros Phono * Park's Audio Budgie SUT * Krell KSA-250 * Harmonic Technology Pro 9+ & Pro 11+ * Signature Series Sonore Music Server w/Deux PS* Twisted Pear Buffalo III Dual Mono ESS Sabre32 DAC * Heavy Plinth Lenco L75 Idler Drive * AA MG-1 Linear Air Bearing Arm * AT33PTG/II & Denon 103R * Richard Gray 600S * NHT B-12d subs * GIK Acoustic Treatments * Sennheiser HD650 *

  • machonemachone Posts: 836
    Just a quick update on the burn in process:

    24 hrs = not good
    48 hrs = not good
    72 hrs = beginning to change
    96 hrs = now we are talking

    The thing I don't get is why it sounded good at power up but at 24 hrs it did not impress and at a level that I was wondering about my decision to upgrade?
    Mojo Audio Joule v5>>Quantum Byte w/JRiver 21 and Fidelizer>> Starlight 7 USB >> Marantz SA 8005>> Equinox 7>>
    Hafler DH-110 Preamp + (Musical Concepts LXII Elite Mod) >>Equinox 7>>
    Hafler DH-500 Amp+ (Musical Concepts PA-6 Elite Mod) >>Belden 5000 10 ga cables>>
    SRS 2.3TL (Fully Modified)...SDA-1A (Fully Modified with Dimensional Tweeter Delete)
    1KVA Dreadnought
    Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
    Yamaha TX-540 Tuner...Sony BDP-S570

    Separate subpanel with four dedicated 20 amp circuits.
    1. Amplification 2. Analog 3. Digital 4. Video

    "All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"
  • Yep2Yep2 Posts: 799
    Ive heard that amp many times in the past, mainly in recording studio environments.
    Always liked it!
    First time I ever heard Spendor speakers was with that amp (modded) in Oklahoma City in a HIGH $$$$ studio!
    VERY impessive combo!
  • motorhead43026motorhead43026 Posts: 2,221
    I always felt large Hafler amps to be something special, and dependable too.


    2 channel: Anthem 225 Integrated amp; Parasound Ztuner; TechnicsTT SL1350; Vincent PHO-8 phono pre; Marantz CD6005 spinner; Polk Signature S60's
    Cables: Wireworld Eclipse IC, Audio Art IC3; Speaker cable LA International SS-800; PS Audio AC-3 power cords; All into a PS Audio Dectet Power center.

    All TV's sound enhanced by Polk Magnfi Mini's.

    Other; SDA2BTL's, M10 series II, M7C's, Hafler XL600 amp, RB-980BX, Parasound HCA-1500 amp , P5 preamp, all in storage.
  • msgmsg Posts: 3,503
    Nice! Curious to hear your impressions as you get more time on it. That does seem kinda weird that it got worse for a bit before sounding good. Is that normal with these kinds of upgrades?

    I have a Hafler Trans Nova 9300 THX that I've been considering recapping. Anyone have any experience with this model?
  • DaveHoDaveHo Posts: 1,570
    Sucks. All the killer piece from back when, that I had no hope of buying, are well past their prime now. I envy those who have managed to find a clean unit and had them restored. No small feat, or price. Bravo!
  • machonemachone Posts: 836
    Got enought hours on the new boards to start showing their stuff.
    Hearing vocals and instruments never heard before. Things like brushes on a snare or the crash of a cymbal out the blackness. It's dead quiet at any volume. More transparent than ever but very natural without any harshness. The dynamics are explosive and contolled.
    This amp seems invisible. I am impressed!
    Mojo Audio Joule v5>>Quantum Byte w/JRiver 21 and Fidelizer>> Starlight 7 USB >> Marantz SA 8005>> Equinox 7>>
    Hafler DH-110 Preamp + (Musical Concepts LXII Elite Mod) >>Equinox 7>>
    Hafler DH-500 Amp+ (Musical Concepts PA-6 Elite Mod) >>Belden 5000 10 ga cables>>
    SRS 2.3TL (Fully Modified)...SDA-1A (Fully Modified with Dimensional Tweeter Delete)
    1KVA Dreadnought
    Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
    Yamaha TX-540 Tuner...Sony BDP-S570

    Separate subpanel with four dedicated 20 amp circuits.
    1. Amplification 2. Analog 3. Digital 4. Video

    "All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"
  • machonemachone Posts: 836
    Over 400 hours of burn-in. It's bordering on spectacular. Very impressed! B)
    Mojo Audio Joule v5>>Quantum Byte w/JRiver 21 and Fidelizer>> Starlight 7 USB >> Marantz SA 8005>> Equinox 7>>
    Hafler DH-110 Preamp + (Musical Concepts LXII Elite Mod) >>Equinox 7>>
    Hafler DH-500 Amp+ (Musical Concepts PA-6 Elite Mod) >>Belden 5000 10 ga cables>>
    SRS 2.3TL (Fully Modified)...SDA-1A (Fully Modified with Dimensional Tweeter Delete)
    1KVA Dreadnought
    Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
    Yamaha TX-540 Tuner...Sony BDP-S570

    Separate subpanel with four dedicated 20 amp circuits.
    1. Amplification 2. Analog 3. Digital 4. Video

    "All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"
  • motorhead43026motorhead43026 Posts: 2,221
    edited July 18
    Did you assemble the boards, or did you purchase already assembled?


    2 channel: Anthem 225 Integrated amp; Parasound Ztuner; TechnicsTT SL1350; Vincent PHO-8 phono pre; Marantz CD6005 spinner; Polk Signature S60's
    Cables: Wireworld Eclipse IC, Audio Art IC3; Speaker cable LA International SS-800; PS Audio AC-3 power cords; All into a PS Audio Dectet Power center.

    All TV's sound enhanced by Polk Magnfi Mini's.

    Other; SDA2BTL's, M10 series II, M7C's, Hafler XL600 amp, RB-980BX, Parasound HCA-1500 amp , P5 preamp, all in storage.
  • machonemachone Posts: 836
    The boards come stuffed and are tested with both the bias and offset preset. The kit includes wire, solder and gold played RCAs, etc. Excellent instructions.
    Mojo Audio Joule v5>>Quantum Byte w/JRiver 21 and Fidelizer>> Starlight 7 USB >> Marantz SA 8005>> Equinox 7>>
    Hafler DH-110 Preamp + (Musical Concepts LXII Elite Mod) >>Equinox 7>>
    Hafler DH-500 Amp+ (Musical Concepts PA-6 Elite Mod) >>Belden 5000 10 ga cables>>
    SRS 2.3TL (Fully Modified)...SDA-1A (Fully Modified with Dimensional Tweeter Delete)
    1KVA Dreadnought
    Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
    Yamaha TX-540 Tuner...Sony BDP-S570

    Separate subpanel with four dedicated 20 amp circuits.
    1. Amplification 2. Analog 3. Digital 4. Video

    "All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"
  • oldrockeroldrocker Posts: 1,632
    Cool story.
    Glad it's meeting your expectations so well.

    I got a 220 sitting in a box somewhere.
  • motorhead43026motorhead43026 Posts: 2,221
    Looks like you replaced the power supply caps as well? Which ones did you opt for?


    2 channel: Anthem 225 Integrated amp; Parasound Ztuner; TechnicsTT SL1350; Vincent PHO-8 phono pre; Marantz CD6005 spinner; Polk Signature S60's
    Cables: Wireworld Eclipse IC, Audio Art IC3; Speaker cable LA International SS-800; PS Audio AC-3 power cords; All into a PS Audio Dectet Power center.

    All TV's sound enhanced by Polk Magnfi Mini's.

    Other; SDA2BTL's, M10 series II, M7C's, Hafler XL600 amp, RB-980BX, Parasound HCA-1500 amp , P5 preamp, all in storage.
  • machonemachone Posts: 836
    LC500's for the caps. Also it was recommended to replace the heat sink over-temp sensors located under the power module. With age they have been seeing them going bad.
    Call John. He will set you up with what ever you need.
    Mojo Audio Joule v5>>Quantum Byte w/JRiver 21 and Fidelizer>> Starlight 7 USB >> Marantz SA 8005>> Equinox 7>>
    Hafler DH-110 Preamp + (Musical Concepts LXII Elite Mod) >>Equinox 7>>
    Hafler DH-500 Amp+ (Musical Concepts PA-6 Elite Mod) >>Belden 5000 10 ga cables>>
    SRS 2.3TL (Fully Modified)...SDA-1A (Fully Modified with Dimensional Tweeter Delete)
    1KVA Dreadnought
    Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
    Yamaha TX-540 Tuner...Sony BDP-S570

    Separate subpanel with four dedicated 20 amp circuits.
    1. Amplification 2. Analog 3. Digital 4. Video

    "All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"
  • motorhead43026motorhead43026 Posts: 2,221
    Thanks, I really want to get the XL600 freshened up. I love these big Haflers.


    2 channel: Anthem 225 Integrated amp; Parasound Ztuner; TechnicsTT SL1350; Vincent PHO-8 phono pre; Marantz CD6005 spinner; Polk Signature S60's
    Cables: Wireworld Eclipse IC, Audio Art IC3; Speaker cable LA International SS-800; PS Audio AC-3 power cords; All into a PS Audio Dectet Power center.

    All TV's sound enhanced by Polk Magnfi Mini's.

    Other; SDA2BTL's, M10 series II, M7C's, Hafler XL600 amp, RB-980BX, Parasound HCA-1500 amp , P5 preamp, all in storage.
  • machonemachone Posts: 836
    Just a quick update on the DH-500.
    It's great. Slowly but surely it just keeps getting better. Smoother with no fatigue; so natural!
    Mojo Audio Joule v5>>Quantum Byte w/JRiver 21 and Fidelizer>> Starlight 7 USB >> Marantz SA 8005>> Equinox 7>>
    Hafler DH-110 Preamp + (Musical Concepts LXII Elite Mod) >>Equinox 7>>
    Hafler DH-500 Amp+ (Musical Concepts PA-6 Elite Mod) >>Belden 5000 10 ga cables>>
    SRS 2.3TL (Fully Modified)...SDA-1A (Fully Modified with Dimensional Tweeter Delete)
    1KVA Dreadnought
    Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
    Yamaha TX-540 Tuner...Sony BDP-S570

    Separate subpanel with four dedicated 20 amp circuits.
    1. Amplification 2. Analog 3. Digital 4. Video

    "All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"
  • pkquatpkquat Posts: 519
    How is the DH-500 noise with the fan? I've heard mixed impressions whether people hear it. Now that it is burning in, how is the richness compared to original Haflers?
  • machonemachone Posts: 836
    Like night and day compared to original Haflers.
    My fan only runs on low. With everything else in the room turned off I can hear the fan but only if I listen for it. FWIW it does not register on my DB meter.
    Mojo Audio Joule v5>>Quantum Byte w/JRiver 21 and Fidelizer>> Starlight 7 USB >> Marantz SA 8005>> Equinox 7>>
    Hafler DH-110 Preamp + (Musical Concepts LXII Elite Mod) >>Equinox 7>>
    Hafler DH-500 Amp+ (Musical Concepts PA-6 Elite Mod) >>Belden 5000 10 ga cables>>
    SRS 2.3TL (Fully Modified)...SDA-1A (Fully Modified with Dimensional Tweeter Delete)
    1KVA Dreadnought
    Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
    Yamaha TX-540 Tuner...Sony BDP-S570

    Separate subpanel with four dedicated 20 amp circuits.
    1. Amplification 2. Analog 3. Digital 4. Video

    "All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"
  • pkquatpkquat Posts: 519
    TY I've been debating on doing an upgrade, but some really nice used amps are less expensive. Plus I only have a DH-220. I've found much of my stuff does benefit from amps in the 200W range.
  • machonemachone Posts: 836
    pkquat wrote: »
    TY I've been debating on doing an upgrade, but some really nice used amps are less expensive. Plus I only have a DH-220. I've found much of my stuff does benefit from amps in the 200W range.

    I get it.

    The Musical Concepts stuff is not cheap. I bought my DH-500 back in the 80s, it finally stopped working so rather than change out a few parts to get it going I decided to have them rebuild it using their PA4 driver boards. Since then I have been slowly upgrading binding posts, IEC inlet, power cord, Dynamat and things like that. This time I upgraded again to their PA6 driver boards AND they just came out with a new power supply upgrade using Jensen 4 pole caps and their CRC design. This upgrade sets you up for their dual toroid transformers.

    Sky's the limit :#

    I does sound great though B)
    Mojo Audio Joule v5>>Quantum Byte w/JRiver 21 and Fidelizer>> Starlight 7 USB >> Marantz SA 8005>> Equinox 7>>
    Hafler DH-110 Preamp + (Musical Concepts LXII Elite Mod) >>Equinox 7>>
    Hafler DH-500 Amp+ (Musical Concepts PA-6 Elite Mod) >>Belden 5000 10 ga cables>>
    SRS 2.3TL (Fully Modified)...SDA-1A (Fully Modified with Dimensional Tweeter Delete)
    1KVA Dreadnought
    Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
    Yamaha TX-540 Tuner...Sony BDP-S570

    Separate subpanel with four dedicated 20 amp circuits.
    1. Amplification 2. Analog 3. Digital 4. Video

    "All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"
  • DSkipDSkip Posts: 13,651
    edited August 11
    machone wrote: »
    pkquat wrote: »
    TY I've been debating on doing an upgrade, but some really nice used amps are less expensive. Plus I only have a DH-220. I've found much of my stuff does benefit from amps in the 200W range.

    I get it.

    The Musical Concepts stuff is not cheap. I bought my DH-500 back in the 80s, it finally stopped working so rather than change out a few parts to get it going I decided to have them rebuild it using their PA4 driver boards. Since then I have been slowly upgrading binding posts, IEC inlet, power cord, Dynamat and things like that. This time I upgraded again to their PA6 driver boards AND they just came out with a new power supply upgrade using Jensen 4 pole caps and their CRC design. This upgrade sets you up for their dual toroid transformers.

    Sky's the limit :#

    I does sound great though B)

    At what point does it become a Musical Concepts and cease being a Hafler? I mean this in jest, but it sounds like they are almost completely redesigning key components.
    audiothesis.com/

    Speakers: Harbeth: P3ESR, 30.2, SHL5+; Usher: CP-6311, Be-10, T-515; Rosso Fiorentino: Elba, Fiesole, Volterra; Polk: T50, Signature S60, S55, S35, S30, S20, S15, RTA 15tl, Sonner Audio Allegro Unum
    Preamps: Shuguang S200MK, Dayens Ampino, Parasound P5
    Amps: Shuguang S845MK, Dayens Ampino Monoblocks, Parasound A23
    Integrateds: Dayens Ampino, Triode Corporation TRV-88SER, MastersounD: Dueventi, Compact 845, Evolution 845; North Star Design Blue Diamond
    Sources: AURALiC Aries, AURALiC Altair, Denon HEOS Link, North Star Design: Magnifico, Supremo, Incanto, Intenso, Venti
    Cabling: Wireworld
    TV: Sony XBR-75X940C
  • machonemachone Posts: 836
    I see your point.
    It's like a B52 with new engines and avionics.
    Mojo Audio Joule v5>>Quantum Byte w/JRiver 21 and Fidelizer>> Starlight 7 USB >> Marantz SA 8005>> Equinox 7>>
    Hafler DH-110 Preamp + (Musical Concepts LXII Elite Mod) >>Equinox 7>>
    Hafler DH-500 Amp+ (Musical Concepts PA-6 Elite Mod) >>Belden 5000 10 ga cables>>
    SRS 2.3TL (Fully Modified)...SDA-1A (Fully Modified with Dimensional Tweeter Delete)
    1KVA Dreadnought
    Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
    Yamaha TX-540 Tuner...Sony BDP-S570

    Separate subpanel with four dedicated 20 amp circuits.
    1. Amplification 2. Analog 3. Digital 4. Video

    "All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"
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