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170dc

  1. ocdecio

    170DC offset odd behavior

    I have a 170DC with a very strange quirk in one of the channels - the DC offset starts off at about +4V, goes down enough to click the relay and starts going in the other direction and when it reaches -2V the relay of course goes in protection. I read here that it could be an open trace...
  2. ocdecio

    170DC inverting input phase

    I rebuilt a blown amp board on a 170DC, and I am now testing with a scope before connecting any load to it. One thing that is puzzling me is that I get a perfectly formed wave, on all frequences, or a perfect square wave. However the wave is shifted 180 degrees. The other channel doesn't do...
  3. ocdecio

    170DC 47uF decoupling caps

    I am working on a 170DC and I see the decoupling caps are only 47uF but rated for 63V (pretty close I'd say rails are -51V). I wonder if there would be any risks by using larger 100uF/100V caps in this place?
  4. lebrun53

    170dc resistor value

    I have a Marantz 170dc on the bench with two dead amps. The service manual schematic shows R728 and R729 as 47 ohms The parts list calls for 150 ohms in those locations. As both amps have been worked on previously, I can't be sure what was originally there. Can anyone tell me which value is...
  5. Richs_Trains

    Marantz 170dc help/advice/guidance Need help after my mistake!

    Hey all, The 140 turned out well with all the help on AK, a few hiccups, but all is good. I also have a 170dc that I would like to refresh. I started with PN00 and replaced the electrolytic caps, I had the exact replacements for all except CN04, which is a 10uf 63v. I put a 10uf 100v in its...
  6. Richs_Trains

    Marantz dual cap question

    Hey all, Just a quick question about dual caps. Several Marantz units use dual caps and many on this forum replace them with two single caps. My question is how do you figure the values necessary for the 2 single caps based on the value on the dual cap. Thank you in advance. Rich
  7. jd3rdcoast

    170DC right side distortion at higher levels + left side heat issue.

    Have had this amp for a few years. Couple issues want to address: 1) Recently noticed right channel audio is distorting at higher output levels. Have swapped sides and follows right output plus remains when bypass 3250B preamp. Popped the cover and checked DC offset. Was 12mV R and -57 mV L...
  8. Dubestar

    Marantz 170 DC Amp has no power on/off how do you properly manage connecting to power?

    Hello, I recently purchased a Marantz 170 DC Amp and have it paired with Marantz 2270 as the preamp. There is no power on/off button on the Amp. The manual says to plug it into the switched AC plug in the back of the Pre Amp (2270) - That works fine, except when I go to turn off the 2270 there...
    • Dubestar
    • Thread
    • 170dc 2270 amp marantz marantz 2270 marantz 2270 as preamp marantz amp popping sound preamp
    • Replies: 3
    • Forum: Marantz Audio
  9. Nac458

    Marantz 170DC Offset, Help!

    Hey all, I've just recently completed a complete re-cap and restoration of a Marantz 170DC. I received the unit in non-working condition. The entire right channel amplifier was disassembled and the output transistors had been removed as they were burned/shorted. I went in and replaced...
  10. Nac458

    Marantz 170DC Problems...

    Hey guys, Just finished installing new capacitors and output transistors on a Marantz 170DC I have. This has been my most significant project yet, so when I hooked it up to my current limiter and the bulb went dim - I was quite relieved. *However, I did notice that the relay took a while to...
  11. Marantz 170DC

    Marantz 170DC

    Marantz 170DC DC Balance
    • terra1
    • Media item
    • 170dc marantz
    • Comments: 0
    • Category: Member Galleries
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