Mains Cables R Us. Temple Audio  Cranage Hifi Show
Page 1 of 4 123 ... LastLast
Results 1 to 20 of 62
  1. #1
    Wammer
    Join Date
     Jan 2010
    Posts
     382
    Location
     manchester
    Real Name
     chris
    Integrated Amp
     Change often
    Speakers
     Altec StoneHenge 1
    In the Hi-Fi industry?
     Yes

    Accuphase E-202 restoration

    So Auralflea (Kevin) contacted me about restoring this Accuphase E-202 and i thought it would make a good thread about restorating a pretty fucked up amp back to its former glory.

    Properly restoring an amplifier isn't just a case of recapping it and setting the offset and bias its much more involved:-

    A complete recap
    All zener diodes replaced
    Any out of spec transistors or any that have known problems replaced
    Any out of spec or stressed resistors replaced
    Adjustment pots replaced with sealed multiturns
    All boards defluxed and cleaned
    All switches and pots cleaned with deoxit
    All solder joints inspected anf resoldered if needed
    Probably a couple more i can't think of at the mo.

    This amp had been with another tech for around six months with an apparent switch fault, which he could'nt rectify. Seems that it had been with a 'tech' for a while i thought the rest (not the switch) would be in tiptop shape, how wrong was I, after further inspection i have found dozens of resistors with cracked insulation only a handful of original transistors and a couple of bodged amutuer repairs.



    heres some pic's and comments.....




    At first glance nothing looks to off, standard japanese layout and component choices, grey Elna caps etc.



    Starting to see things that arn't original, the most obvious being the RS rectifier which has replaced the original rectifier pcb. As you can see its been installed in a pain in the arse place and the pins on the big psu cap underneath have been bent to accomadate it, pretty shoddy soldering as well.



    More worring soldering (Just tagged on the pins) on the circuit breaker.



    Psu circuit board



    The irreplacable STV diodes have been moved to the back of the board.

    Poweramp board

    Last edited by reddish75; 24-05-2012 at 06:48 PM.

  2. #2
    Wammer Teti's Avatar
    Join Date
     Mar 2011
    Posts
     131
    Location
     Kent
    Real Name
     Martin
    Turn Table
     Transcriptors
    SUT/Phono
     Whest Audio
    Digital Source 1
     MSB
    Integrated Amp
     McIntosh
    Speakers
     Tannoy
    In the Hi-Fi industry?
     No
    Great job indeed! How long did it take?

  3. #3
    official miserabilist auralflea's Avatar
    Join Date
     Jun 2006
    Posts
     2,620
    Location
     Black Country
    Real Name
     Kevin
    Turn Table
     TT1: Pioneer PL71
    T/Arm & Cart
     TT2: Sony PS-FL77
    SUT/Phono
     Angle/Lynwood/Lumley
    Digital Source 1
     Marantz CD63 KI
    Digital Source 2
     PC
    Integrated Amp
     still in surgery
    Speakers
     DeccaVolts
    Pre Amp
     Lumley Reference
    Power Amp
     Pioneer M-10X
    In the Hi-Fi industry?
     No
    I am a bit taken aback to see how much this amp had been fiddled with previously, although being some 40 years old or so I shouldn't be too surprised.


    Looking forward to the updates as you go Chris, and really looking forward to hearing the end result!
    A flea in the ear is worth two in the bush

    Sarchasm - the gulf between what is said and the person who doesn't get it.

  4. #4
    Super Wammer enbee23's Avatar
    Join Date
     Nov 2005
    Posts
     2,855
    Location
     Middle of Scotland,
    Real Name
     Nick
    In the Hi-Fi industry?
     No
    Quote Originally Posted by Teti View Post
    Great job indeed! How long did it take?

    I think we're still at the "before" stage.

    Very much looking forward to see how this works out, I have a couple of related boxes here that might benefit from similar attention.

  5. #5
    Acc shut see Purité North
    Join Date
     Dec 2007
    Posts
     14,976
    Real Name
     Purité North
    In the Hi-Fi industry?
     Yes
    Huge respect to Chris for taking this on - these are complicated amps with many hard-to-find components, and this is one job I refused (sorry Kevin) - looking at the issues you've found, I don't regret that decision one little bit! (sorry again Kevin! )

    I'll watch this thread with interest! Best of luck

  6. #6
    Super Wammer
    Join Date
     Oct 2006
    Posts
     2,642
    Location
     Wirral
    Real Name
     James
    Digital Source 1
     WaveIO
    Digital Source 2
     Pure i20
    DAC
     DIY ES9023
    Integrated Amp
     Campion
    Speakers
     Orelle Orator
    In the Hi-Fi industry?
     No
    Blimey, respect Chris. I wouldn't fancy that! Just recapped my AI Alto yesterday - smallfry in comparison!
    Last edited by James Evans; 25-05-2012 at 02:37 PM.

  7. #7
    official miserabilist auralflea's Avatar
    Join Date
     Jun 2006
    Posts
     2,620
    Location
     Black Country
    Real Name
     Kevin
    Turn Table
     TT1: Pioneer PL71
    T/Arm & Cart
     TT2: Sony PS-FL77
    SUT/Phono
     Angle/Lynwood/Lumley
    Digital Source 1
     Marantz CD63 KI
    Digital Source 2
     PC
    Integrated Amp
     still in surgery
    Speakers
     DeccaVolts
    Pre Amp
     Lumley Reference
    Power Amp
     Pioneer M-10X
    In the Hi-Fi industry?
     No
    Quote Originally Posted by earlofsodbury View Post
    Huge respect to Chris for taking this on - these are complicated amps with many hard-to-find components, and this is one job I refused (sorry Kevin) - looking at the issues you've found, I don't regret that decision one little bit! (sorry again Kevin! )

    I'll watch this thread with interest! Best of luck


    As I recall it, you declined the job before I even asked!! Not that I blame you at all, this looks to be a seriously time-consuming job ahead for Chris.
    A flea in the ear is worth two in the bush

    Sarchasm - the gulf between what is said and the person who doesn't get it.

  8. #8
    Wammer
    Join Date
     Aug 2010
    Posts
     449
    Location
     Western Australia
    Turn Table
     Technics SP10&plinth
    T/Arm & Cart
     Jelco /Supex 900II
    SUT/Phono
     Yaqim MS 22B
    Digital Source 1
     AudioGd7SE
    Digital Source 2
     Sony CDP715
    DAC
     Moon 300D
    Integrated Amp
     Almarro 318B.Ac E202
    Speakers
     Sonique Encore SE
    Pre Amp
     Supratek Cabernet
    Power Amp
     Usher1.5 -2 of
    In the Hi-Fi industry?
     No
    I bought one of these and the preamp/power amp selector has been bypassed so I cannot use them separately.
    The switch must be buggered.
    Any ideas on the best way of restoring this function?

    This one has been reconditioned.It seems all the electrolytics have been replaced with Rubicons.Power supply caps are RS Components.
    Also the left hand side near the front has had a grid pattern of holes drilled in it.Obviously overheating here was a problem.

    It sounds very good.Certainly the best integrated amp I have used.
    A classic combination with Gale 401 speakers.

  9. #9
    Wammer
    Join Date
     Jan 2010
    Posts
     382
    Location
     manchester
    Real Name
     chris
    Integrated Amp
     Change often
    Speakers
     Altec StoneHenge 1
    In the Hi-Fi industry?
     Yes
    New switch? Should beable to buy one from Rs, if not take the switch out and join the rca's with phono lead you can then use them seperatly if you know what i mean.

  10. #10
    Wammer
    Join Date
     Jan 2010
    Posts
     382
    Location
     manchester
    Real Name
     chris
    Integrated Amp
     Change often
    Speakers
     Altec StoneHenge 1
    In the Hi-Fi industry?
     Yes
    The mouser order turned up, 112 different components some with multiples of the same.....



    Never before have i had to change so much inside an amp but, this thing is so far gone needs must. Some compromises i have had to make are using radial caps (panasonic FC/FM) instead of axials as the quailty and performance is much better and using different resistors than i would normally (i usually use vishay rn's) simply because of the large number that need replacing.

    Now the work begins!

  11. #11
    Acc shut see Purité North
    Join Date
     Dec 2007
    Posts
     14,976
    Real Name
     Purité North
    In the Hi-Fi industry?
     Yes

  12. #12
    official miserabilist auralflea's Avatar
    Join Date
     Jun 2006
    Posts
     2,620
    Location
     Black Country
    Real Name
     Kevin
    Turn Table
     TT1: Pioneer PL71
    T/Arm & Cart
     TT2: Sony PS-FL77
    SUT/Phono
     Angle/Lynwood/Lumley
    Digital Source 1
     Marantz CD63 KI
    Digital Source 2
     PC
    Integrated Amp
     still in surgery
    Speakers
     DeccaVolts
    Pre Amp
     Lumley Reference
    Power Amp
     Pioneer M-10X
    In the Hi-Fi industry?
     No
    A flea in the ear is worth two in the bush

    Sarchasm - the gulf between what is said and the person who doesn't get it.

  13. #13
    Wammer
    Join Date
     Jan 2010
    Posts
     382
    Location
     manchester
    Real Name
     chris
    Integrated Amp
     Change often
    Speakers
     Altec StoneHenge 1
    In the Hi-Fi industry?
     Yes
    A quick update as now back off annual holiday, Psu regulator card has almost been completed just waiting on a few missing parts to turn up. As you can see only 3 original transistors have survived the hacked attemps of repair, the replacements have been replaced with correctly crossreferenced parts, also i dont know whats happening with the resistors in this amp but the enamel is shrinking/cracking on nearly all of them, poor quality maybe?


  14. #14
    Wammer
    Join Date
     Mar 2010
    Posts
     423
    Location
     S.Wales.
    Real Name
     Andy
    Digital Source 1
     Quad 99 CDP2
    Integrated Amp
     XTZ Desire AP-100
    Speakers
     PMC DB1S+
    In the Hi-Fi industry?
     No
    Wow great thread.

    Butuz
    n00b System:
    Quad 99 CDP2 >> Pass B1 Pre >> XTZ Desire AP-100 >> PMC DB1S+

  15. #15
    Acc shut see Purité North
    Join Date
     Dec 2007
    Posts
     14,976
    Real Name
     Purité North
    In the Hi-Fi industry?
     Yes
    Quote Originally Posted by reddish75 View Post
    A quick update as now back off annual holiday, Psu regulator card has almost been completed just waiting on a few missing parts to turn up. As you can see only 3 original transistors have survived the hacked attemps of repair, the replacements have been replaced with correctly crossreferenced parts, also i dont know whats happening with the resistors in this amp but the enamel is shrinking/cracking on nearly all of them, poor quality maybe?

    Hope you're going to do something about the heatsinks on those regs! Might just explain the cracked R...

    Actually I've just started a similar but less daunting job on a Meridian 200 series CDT and DAC - christ it's fragile!!!

  16. #16
    Wammer
    Join Date
     Jan 2010
    Posts
     382
    Location
     manchester
    Real Name
     chris
    Integrated Amp
     Change often
    Speakers
     Altec StoneHenge 1
    In the Hi-Fi industry?
     Yes
    The heatsinks are there just to see if it fires up, they are a replacement item someone's put in as it looks like (as I have found) good replacements for these transistors are the wrong orentation I.e the back of the transistors face the wrong way. And it's getting to be a twat to find replacement sinks

  17. #17
    Acc shut see Purité North
    Join Date
     Dec 2007
    Posts
     14,976
    Real Name
     Purité North
    In the Hi-Fi industry?
     Yes
    Quote Originally Posted by reddish75 View Post
    The heatsinks are there just to see if it fires up, they are a replacement item someone's put in as it looks like (as I have found) good replacements for these transistors are the wrong orentation I.e the back of the transistors face the wrong way. And it's getting to be a twat to find replacement sinks
    Ah, transistors - I'd think about putting them on flyleads and bolting them to the main heatsink - the scorching on that PCB is pretty severe!

  18. #18
    official miserabilist auralflea's Avatar
    Join Date
     Jun 2006
    Posts
     2,620
    Location
     Black Country
    Real Name
     Kevin
    Turn Table
     TT1: Pioneer PL71
    T/Arm & Cart
     TT2: Sony PS-FL77
    SUT/Phono
     Angle/Lynwood/Lumley
    Digital Source 1
     Marantz CD63 KI
    Digital Source 2
     PC
    Integrated Amp
     still in surgery
    Speakers
     DeccaVolts
    Pre Amp
     Lumley Reference
    Power Amp
     Pioneer M-10X
    In the Hi-Fi industry?
     No
    Goodness gracious me! Nice work there so far my man. Looks like this is going to keep you busy until Christmas (Sorry about that!)



    The new, shiny parts of that board look pretty though (depths of my technical knowledge there)
    A flea in the ear is worth two in the bush

    Sarchasm - the gulf between what is said and the person who doesn't get it.

  19. #19
    Frugalphile Howlindawg's Avatar
    Join Date
     Mar 2009
    Posts
     3,174
    Location
     Leixlip, Ireland
    Real Name
     Martin
    Turn Table
     Technics SL1210 M5G
    T/Arm & Cart
     AN / Benz Glider
    SUT/Phono
     DIY
    Digital Source 1
     SB Touch
    Digital Source 2
     Meridian 507
    DAC
     dCS Purcell + Elgar
    Integrated Amp
     Luxman SQ-38u
    Speakers
     Usher Dancer Mini-2
    Pre Amp
     DIY
    Power Amp
     DIY
    In the Hi-Fi industry?
     No
    Will watch this one with interest...
    The truth may be out there, but the lies are inside your head.

  20. #20
    Wammer
    Join Date
     Jan 2010
    Posts
     382
    Location
     manchester
    Real Name
     chris
    Integrated Amp
     Change often
    Speakers
     Altec StoneHenge 1
    In the Hi-Fi industry?
     Yes
    Now the kids are back at school work can commence again, rebuilt the first poweramp board this morning, same problems as the powersupply board, nearly everything overheated and heat damaged, mostly new resistors have been installed as the originals were falling apart, a recap, new matched input pair transistors and new zeners and adjustment pots.

    Pic's to enjoy.

    Notice the heatmarks on the board,


    Cleaned


    Ready for soldering,


    Completed (apart from two out of stock resistors)
    Last edited by reddish75; 04-09-2012 at 11:07 PM.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •