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<1234567…14>
  • Component Equivalents/substitutionsA while ago, I mentioned to somebody in a thread that we should have a list of component equivalents and substitutions so that it's easier to fix our…

    ... BC183, BC238, BC383
    ZTX650 can be replaced with BC537 ... br /> ZTX313's in TR1/TR2 position can be ... 2369 can be used in TR1, 2, 3 and ... has experienced problems substituting TR4 ZTX650 with a BC487. Transistor ... odious;218176]ZTX 312 at TR1, TR2, TR3 and ...
    DEATH DEATH December 2006 Hardware
  • Best replacement for ZTX650?What is the best replacement transistor for the obsolete ZTX650? I've read that TIP31 will do the trick. Is there a decent equivalent from the BC or …

    What is the best replacement transistor for the obsolete ZTX650?
    I've read that TIP31 will do the trick.
    Is there a decent equivalent from the BC or others transistors?
    gtsamour gtsamour December 2006 Hardware
  • tr1-2-3-4-5hi guys, can someone tell me, what is the exact function of each of the five transistors i have on my zx+3 i mean the black transistors TR1 TR2 TR3 T…

    hi guys,
    can someone tell me,
    what is the exact function of each of the five
    transistors i have on my zx+3
    i mean the black transistors TR1
    TR2 TR3 TR4 TR5,
    thanx,
    rigasrigas1980 rigasrigas1980 November 2007 Hardware
  • Strange device, TR1?Browsing through ebay I came across someone selling a [URL="http://cgi.ebay.co.uk/1982-ZX-spectrum-tape-machine-docking-station-games-/280599485408?p…

    ... devices in it was a TR1, picture was a bit blurry ...
    Macc Macc December 2010 Hardware
  • ZTX650 and ZTX213Hi I have one +2 which was completly dead but after confirming 78S05 was faulty I replaced it. Afterwards it powers up but there is no TV or composit…

    ... /> First thing to replace are ZTX650 and ZTX213 I guess.
    ZTX650 (here I can not find ...
    netomc netomc April 2012 Hardware
  • TR1 & TR2 replacement - now dark picture?Hi all I saw a list of diodes you could swap out for better modern equivalents. I saw TR1/2 could be replaced with BC547 which i had afew of (BC547 …

    ... better modern equivalents. I saw TR1/2 could be replaced with ... BC547, BC548 and BC549 in TR1/TR2 position (Usually improves picture ...
    dreamscape dreamscape September 2014 Hardware
  • Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …

    ... , recheck the ULA and change TR1/2 (replace with BC547) if ... . If not, check the coil, ZTX650 AND the ZTX213, zener diode ...
    DEATH DEATH March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... , recheck the ULA and change TR1/2 (replace with BC547) if ... . If not, check the coil, ZTX650 AND the ZTX213, zener diode ...
    DEATH DEATH March 2007 Hardware
  • First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…

    ... substitute for the ZTX650 (Obsolete) (TR4)

    for TR1,2, 3 ...
    Edge Edge October 2013 Hardware
  • First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…

    ... transistors[/B][/U]

    TR1 - ZTX313 ------------- Replacement #1
    TR2 ... - ZTX313 ------------- Replacement #1
    TR4 - ZTX650 ------------- Replacement ZTX651
    TR5 - ZTX213 ...
    1024MAK 1024MAK October 2013 Hardware
  • 16pf Capcitors for C72/C73 issue 3b. Can I use 18pf?Looking at the service manual it states to use a 16pf ceramic disc capacitor in positions C72 and C73 on issue 3b boards. Is this very critical in bo…

    ... MPS2369's are used for TR1/TR2, this may cause white ... stock.

    3. ZTX313(TR1/2/3/6) Transistors TO ... to find.

    5. ZTX650(TR4) - Another unobtainable, but the ...
    Your Spec-chum Your Spec-chum October 2021 Hardware
  • Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …

    ... , and lots of ZTX213 and ZTX650 transistors, so I'm well ...
    Spirantho Spirantho May 2005 Sinclair Miscellaneous
  • Spectrum Spare parts neededI have a customer in Croatia purchasing some items from me, but to save on postage and currency conversion costs, can anyone supply the following ite…

    ... /> Spectrum's COIL, ZTX313 / ZTX213 / ZTX650 transistors
    Spectrum 48K ROM ...
    rwap rwap December 2006 Wanted
  • Spectrum Issue two problemI managed to bring back to life a issue two spectrum (at least the power supply cirquit). The screen is now crystal clear (after replacing all the el…

    ... the electrolytic capacitors and transistors tr1 and tr2).
    The thing ...
    gtsamour gtsamour December 2006 Hardware
  • Shivery picture.I have two spectrums that show a shivery picture (vertical axis). The picture is crystal clear, it's just a slight vertical jitter but it is annoying…

    ... could be the problem. The tr1 and tr2 transistors have been ...
    gtsamour gtsamour January 2007 Hardware
  • Issue two picture qualityDoes anyone know if issue two and earlier spectrums have worse picture quality (in general, beside colours) compared to issue 3 and later? I mean on…

    ... version speccys.
    Having replaced tr1 and tr2 ransistors and electrolytic ...
    gtsamour gtsamour January 2007 Hardware
  • TV Modulator. Can it be repaired?Is it possible, to repair tha TV modulator (after removing it) if it gives wavy picture? I replaced both transistors (tr1/2) and both electrolytic ca…

    ... ?
    I replaced both transistors (tr1/2) and both electrolytic caps ...
    gtsamour gtsamour March 2007 Hardware
  • What useless info do you know?Something that you will take to your grave (Spectrum or not) but absolutely no use to anyone: - POKE 23658,8 - Turns caps lock on, on a Spectrum - O…

    ... in a Spectrum is a ZTX650
    - In the PAL television ...
    IN31 IN31 April 2007 Chit chat
  • TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…

    ... get hot, I mean the ZTX650 is not even noticibly warm ...
    gtsamour gtsamour May 2007 Hardware
  • sinclair zx spectrum issue 6a (again) - how to repairHi All, Is there someone who may explain what these jumpers can be used for. [url]http://forest.no-ip.org/repair/jumpers.gif[/url] <- this is from …

    Hi All,
    Is there someone who may explain what these jumpers can be used for.
    [url]http://forest.no-ip.org/repair/jumpers.gif[/url]
    gorski gorski February 2008 Hardware
  • Blown standard divideI recently bought a SIY divide kit from Papaya labs and after i soldered everything, it worked perfectly. I've used it 5-6 times without problems (Fa…

    ... up the power cirquit transistor (ZTX650)
    blew.
    Tried it ...
    gtsamour gtsamour April 2008 Hardware
  • Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…

    ... />
    Also, I wonder, because ZTX650 is for 2A, and some ... (Ic=0,5A) instead of ZTX650.
    I have no idea ...
    65C02 65C02 June 2008 Hardware
  • issue 6a faultyHi All I got issue 6a pcb from ebay with status faulty pcb had bad voltages when I power up I changed tr4 ztx650 and all voltages got back on ic6 I h…

    ... up
    I changed tr4 ztx650 and all voltages got back ...
    gorski gorski March 2009 Hardware
  • zx spectrum +High i bought a spectrum + a while back that endend up that it didnt work.. the screen was just a scramble of colours..ive change the ktc(ztx650) and…

    ... colours..ive change the ktc(ztx650) and now all the voltages ...
    kenny.tigger kenny.tigger January 2010 Hardware
  • Trying to fix Spectrum Issue TwoHello everybody, I bought from eBay three Spectrums - one is Issue Two and the other two are Issue 3. The Issues 3s look like they are working but t…

    ... ;ssPageName=STRK:MEWNX:IT#ht_2821wt_1167]ZTx650[/url]) and TR5 ([url=http ...
    Valentin Valentin April 2010 Hardware
  • Challenging the orthodoxy - Composite modWell, what's brought this on is two things: firstly I composite-modded an Issue 4S board this weekend in preparation for the Vintage Computing Festiv…

    ... ). The first is formed of TR1 and R51 (R52 is for ...
    Winston Winston June 2010 Hardware
  • Question about 7805 regulatorOne of my common practices when I service a ZX machine, is to replace the electrolytic caps as well as the 7805 regulator and some times the ztx650 t…

    ... regulator and some times the ztx650 transistor.

    I was ...
    gtsamour gtsamour January 2011 Hardware
  • Fuzzy Screen On 48k Spectrum.Hi there. I bought a Spectrum off eBay last week (another for my collection lol), and it suffers with a fuzzy screen e.g. it looks like interference …

    ... . While probing middle legs of tr1 & tr2 on good unit ...
    Jimbob-Squarepants Jimbob-Squarepants January 2011 Hardware
  • ZX Spectrum - power supply transistors....I overbought in case I had any failures while repairing my Speccys but I did not need any spares so these are now surplus to requirements. I have thr…

    ... is an substitute for the ZTX650).

    The price within ...
    weathereye weathereye March 2011 Sales
  • ZX Spectrum + alive thanks to this site.I was given a dead unit several months ago. I finally had time to look at it yesterday. Using the repair guide on this site the thing is now alive.…

    ... alive. One 7805 and one ztx650 tr4 and it is all ...
    68k-dude 68k-dude July 2011 Hardware
<1234567…14>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
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    John Elliott on April 21
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    rich_chandler on April 21
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  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
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    mel the bell on April 20

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ztx650 239 313

Related Threads

  • Best replacement for ZTX650?What is the best replacement transistor for the obsolete ZTX650?<br /> I've read that TIP31 will do the trick.<br /> Is there a decent equivalent fro…
  • tr1-2-3-4-5hi guys,<br /> can someone tell me,<br /> what is the exact function of each of the five<br /> transistors i have on my zx+3<br /> i mean the black t…
  • Strange device, TR1?Browsing through ebay I came across someone selling a [URL="http://cgi.ebay.co.uk/1982-ZX-spectrum-tape-machine-docking-station-games-/280599485408?p…
  • ZTX650 and ZTX213Hi<br /> I have one +2 which was completly dead but after confirming 78S05 was faulty I replaced it.<br /> Afterwards it powers up but there is no TV…
  • Replacing ZTX650 with BD139Today I blew up one of the GALs on one of my DivIDEs while testing on my Toastrack.<br /> Shorted M1 with 12V and the 12V circuit broke.<br /> I had …
  • TR1 and TR2 replacementCan anyone tell me the correct replacement part for these? This is for an Issue 4S btw
  • TR1 & TR2 replacement - now dark picture?Hi all<br /> <br /> I saw a list of diodes you could swap out for better modern equivalents. I saw TR1/2 could be replaced with BC547 which i had afe…

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