Nad 7225pe audiokarma. Messages: 78 Aug 12, 2023 · AudioKarma Audio Forums.
- Nad 7225pe audiokarma. NAD 7225PE - need a method to isolate TO3 case aka collector from chassis ground NAD 7225PE - distortion on both channels Dec 18, 2010 · Hello, the nad was working good, then one day the left channel died. Paid $70 for everything so not a super score but they are in mint condition. Also in the mix were a 7240PE and a 7225PE. If you have a working NAD amp or receiver, my advice is to change out the caps for something better. I get no lights , no sound , no display , nada. I came accross a fairly good deal on a used NAD 7225pe receiver (25w per channel 8ohm). Jun 2, 2021 · AudioKarma Audio Forums. I just figured for the money, why not? A couple months back the receiver in my main system quit working. NAD 7225PE and a pair of PSB Alpha Mites. There is a symbol silkscreened on the PC board in the positions where a TO126 transistor is located. 7mV ie, GND sides Aug 12, 2023 · C443 still out, probably a trace issue. Difficult to progress Aug 12, 2023 · Not yet. PE stands for Power Envelope, which was the marketing moniker of the time for NAD’s high-current amp system. In the Apr 20, 2020 · Sorry to hear that johnmem. I get no sound and not auto seek or station lock. NAD 7225PE Restore Fail! Thread starter NAD 7225PE Restore Fail! Thread starter notdigital; Start date Feb 19, 2012 · Hey folks, I've owned a NAD 7225PE receiver for a few years. In the store I plugged it in, saw the tuner display light up, and off into my bag it went. In testing it, I hooked up two sets of speakers: a pair of JBL L19s (8ohm max power 70w) and Boston Acoustics A40 mk. I know that the 7020 is based on the well regarded 3020 amplifier but I think I could use the extra wattage delivered by the 7225 since my speakers are rated at 89db sensitivity. The build quality is also a fair bit May 13, 2020 · May 13, 2020. 7mV C407, GND at -2. NAD Owners, Let's see your systems! NAD 7225PE receiver, Monitor Audio S6 Silver speakers View attachment 2261752 View Sep 20, 2022 · Over the past 10 or so years, I have managed to revived several NAD 3020's, a couple of 1020's, a 2100, two 513's, a 502 and a 5100. I managed to find a manual on the internet. I am on travel starting mid-week, until the end of the month. Oct 26, 2016 · Audiokarma Home Audio Stereo Discussion Forums. The amp all works expect for the FM band. Jun 21, 2024 · Well, I'm old enough to remember this, but I guess that's also the problem!! HA!! Does anyone here know what the specific differences were between the NAD 1020, 1020A and later 1020B pre-amps? I want to say it had something to do with the phono pre-amp section, but maybe there were other differences. It's 3AM here and I should not have woken up so early but I did. Today, with the walls creeping in ever closer, I decided to break it out and see what I Jun 17, 2012 · pfm Member. Apr 23, 2014 · I know these can be repaired, but I already have working 7225PE and 7020, and I figured this would be much cheaper than getting a NAD pre for a 2100 power amp I also have. The AM side seems to work (I can pick up stations). It really sounds great, but it's developed a small hum in both channels. Photo of Q112 is attached. Plugged it in with a cd input and got some rough and dim sound out of both channels. I'm struggling here with the oscillation thing. NAD 7225PE Thermistor? Discussion in 'Solid State' started by Mumbles, Feb 15, 2023. At £10, I couldn't really leave it there. Solid State . Aug 12, 2023 · AudioKarma Audio Forums. I'm all in favour of reducing the carnage Aug 12, 2023 · First, the statement that "the last time the outputs were in" only strictly applies to Q416, as this was the only one vauxhall had both B and E in circuit when his tests were done (post # 95). Dec 14, 2005 · AudioKarma Audio Forums. But the seek is a bit touchy. The only thing I did do last night was measure Aug 12, 2023 · Agree with northpaw, voltages generally ok however R520/R517 is on the low side. Mumbles Member. Not unexpected, of course, since they were filling in for conrad-johnson, Linn, and Audio by Van Alstine pieces when I was between gear changes or wanted to Apr 23, 2015 · FWIW, the 72040PE and 3240PE, which are late 80s designs, have phono stages that are based on the NJM2043 opamp whereas the 3020 is a fully discrete design. Apr 9, 2020 · Armed with this info, I approached a 30-odd-year-old NAD 7225PE in the dining room, which I use a few hours several days a week, driving a pair of OLAs. - Film and ceramic caps in left power amp. You are always welcome to chime in. DBT again begins dark and steadily brightens but more slower - say 2 minutes. Mar 10, 2022 · I have examples of two TO3 2N3055 transistors from two different manufacturers. I believe this second PS is supplying part of the Aug 12, 2023 · Since the problem is evident with this configuration then try caps across diode and Q417. Thread starter New to Audio - have NAD Receivers 7225pe & 712 - which to keep? r-mm; Oct 27, 2019;. The owner was an elderly woman so I didn't try my usual bargaining routine. NAD 7225PE - need a method to isolate TO3 case aka collector from chassis ground NAD 7225PE - distortion on both channels Aug 12, 2023 · AudioKarma Audio Forums. The 7225PE is easier to find online for parts, I just don’t know if it will mount right and fit. NAD 7225PE - need a method to isolate TO3 case aka collector from chassis ground NAD 7225PE - distortion on both channels Sep 24, 2012 · Wanting something a different from my Sansui, I have kind of settled on either the NAD 7225pe or the 7020e. Both PE models did no go well. Aug 12, 2023 · OK, I'm leaning towards an oscillation issue based on the increasing DBT brightness, no issue if KSC replaces BC550 at Q401. DBT should be dim (confirm) and yes try power up without DBT and remeasure psu voltages. Let me explain a bit more of my reasoning concerning the next steps. I know that the nad has less output, but that isn't important to me since I'd be using the amp to drive efficient speakers in a near field setup. DBT brightens Lift one leg of R429 Did that and again, DBT brightens. Within a couple Aug 12, 2023 · would a small value cap stuck between B and E to duplicate the original transistor's junction capacitance work in place of the resistor if that is indeed whats going on? Seems that would be a little less invasive. Feb 15, 2023 · Audiokarma Home Audio Stereo Discussion Forums. Aug 12, 2023 · A short break is a good idea, mbz. My son and I opened it up and we saw some soot under the top cover. Replace any that have not already been replaced Referring to the SM Aug 12, 2023 · Search titles only By: Search Advanced search… Aug 12, 2023 · I didn't want to get too many cooks going. I came across a stereo receiver - an NAD 7225PE. Nad 712. Dec 18, 2010 · Hello, the nad was working good, then one day the left channel died. Nov 20, 2008 · NAD claims this receiver is based on the classic 7020, but does anyone know if its the same (or almost the same) circuit as the original 7020/3020? It uses metal cased output transistors, pretty strange for a mid-late 80's unit IMO. If you happen to have a 0. Also check the other parts in that area. British Audio . 6mV C415/417 GND at -2. I swore off any NAD with PE in the model number. I thought it might be Dec 31, 2007 · I have a NAD 4225 tuner that appears to be dead. Q406,Q408 ,Q410,Q412 just in case. In the meantime, I have discovered that I think it sounds really good! Anyways, I am planning on doing some maintenance, to keep it in good condition, and learn Mar 6, 2023 · Might be cheaper and easier just to find a parts unit, and take the transformer. Didn't really have a need for it at the time I bought it. Aug 12, 2023 · Also this morning I was handed 7lbs of pears and 10 or more lbs of plums with requests to turn into jam. The phono sounds almost like a high filter is engaged and Jun 25, 2010 · I also like warm sound and have Vandersteen 1C's in one room and Bose 301 series V speakers in the other. I've been watching the progress though. II (40w max, 8ohm) and tried running them both at the Mar 24, 2012 · I have a NAD 7225 on my bench for repairs, and have been having a look around all of the useful contributions on this site about the amp. More and more frequently now, it will also not produce any sound on start up, and then after a few minutes of warming up it will suddenly just kind of surge on with the sound fading in. Would anybody here have a schematic for this critter? I would buy one from fleabay , but I got laid off the week before Christmas and am now officially a Cheap Bastard. Bought it at a yard sale for something like $15 or $20. -- If that is not OK, you will need to fit a jumper between the brass fitting and the chassis. The +41V rail, which looks ok, is referenced/driven by the -28V rail and the voltage at R520/R517 which controls Q509. He replaced the fuses and put on the receiver only to find the fuses blowing again - so I have taken on the task of Jun 27, 2020 · Hi all, I have a NAD 7240PE with a tuner problem and was hoping for some help troubleshooting. 10µF film cap, you could go with that, but otherwise, yes, the original ceramic disc should go back in. However, in the 7225PE, it appears that a regular cap is used, albeit a relatively high capacitance one (C914). It places a great emphasis on setting the speaker Hello, I am getting into vintage second hand audio equipment and fairly new into this. Shorting 402 put the 42v ps voltage across the R430. 3mV np -6. Both in nice shape. #1. But when connected to a device that happens to display hFE, the number shown is 475. 2mV, np -6. Oct 27, 2019 · By coincidence a friend gave me a NAD 712 (1995) the same day i bought a 7225pe (late 80s early 90s I believe). Aug 8, 2023 · This is regarding a non-working NAD 7225PE that I was given two years ago and it looks like component replacement already occurred. That was the case as far as I could tell as well. The very helpful person from whom I bought it told me that the receiver blew when he accidentally shorted the speaker wires. Anyway, looking further at other grounded caps C441, GND at -2. . And since we subsequently learned that right channel drivers (Q412 and Q414) were in bad shape Jan 11, 2018 · AudioKarma Audio Forums. Discussion in 'General Audio Discussion' started by Abouna, Oct 25, 2016. Consequently, I've been looking at the schematic and plan to check for the +41 volts that's supposed to be present at R456. It was not working and showed the signs of burn out with R453 smoked,R431 and 447 had been hot. 047µF original spec. At first, the bulb (frosted) was not illuminated, but if I peered closely I could just make out the dull glow of the filament inside. Check out the rest of the transistors on that side. The fact that NAD are still in business making audio gear, when so many of the other great names are either gone or exist in name only tells its own story. So until I Aug 12, 2023 · - Solder a jumper across the thermal switch(?) or whatever it is E-401A-35 Did that and no difference. I'm new to audio and going from listening on computer speakers to setting up a simple bookshelf system to listen to the radio and bluetooth in music from my phone. Jun 17, 2012. 2V; ca. My experience is that either a super cap or a battery is typically used for something like this. I find the Vandersteens to be really tolerant of low-powered receivers, and mine sound great even driven with a 25 watt NAD 7225PE (the Bose didn't impress until hooked up to some Audio by Van Alstine separates with greater quality and control). 9V isn't a value I recall seeing on the part Aug 12, 2023 · Erratic behaviour of GND side of C443 caught my eye. NAD 7225PE replacing transistors 2N3055 and MJ2955! NAD 7225PE replacing transistors 2N3055 and MJ2955! Thread starter Nov 10, 2011 · A reciever I have, ( NAD 7225PE ), has a switch for 4 Ohm or 8 Ohm output. The transformer from a 7225PE receiver ought to be the same, maybe with some extra secondary windings for the tuner section. 415 and Q417 are the outputs, Q411 and Q413 are the drivers, Q409 is the biasing transistor, also called a Vbe Sep 27, 2013 · My 7240 is a later-generation unit in the NAD line, one generation or two after the legendary 3020 series. 0Ω between C443 gnd leg and the heatsink, and 0. I've been over in the UK for a few days to deliver a paper, and spent Saturday afternoon wandering around a few charity shops. The existing Motorola 2N3055 appear OK using diode mode of a DMM. I have no background in electronics, lot's of experience with vintage gear, some experience with troubleshooting and tinkering, my soldering skills are bad, I have a Nov 7, 2007 · Hi I picked up a NAD 7220PE today for $20. I Aug 12, 2023 · Yes, those two other caps are 0. I may still try for a couple more hours sleep. Hmmm. They both have equal volume levels but both sound really bad Dec 20, 2014 · 1) Anyone know where I can find a 7220PE transformer with the additional 40V rails? After a little googling, the NAD 7225PE looks like it’s has the same rails. Dec 25, 2021 · I was wondering if a nad 7225pe would be an upgrade over a jvc jr-s300 in terms of soundstage and resolution. 00047µF, much smaller than the 0. Nad S300 repair refresh Is a NAD 7225pe a worthwhile upgrade over a JVC jr-s300? DAV1326; Dec 24, 2021; Solid State; Replies 4 Mar 22, 2013 · I have a NAD 7020e that I use as a power amp from my HT Receiver outs. This morning, I installed IN4148 diodes between E & B of Q411 to Q414. Aug 12, 2023 · From the "For what it is worth" department: I just started my unit up on 60W DBT, in an unlit room but next to a north window with 5pm daylight. 5Ω between C443 gnd leg and chassis The heatsink is off. Septuple checked polarity because each PNP/NPN pair is reverse Aug 12, 2023 · The foil trace connecting the C443 pin and the brass fitting does not extend anywhere else. At least not within the 7225PE and 3225 SM's I saw on HiFi Engine and elsewhere. we replaced R453, R455 and C451 and plugged it Jul 31, 2015 · Someone does the same with a NAD amp, and it's a piece of junk. When running 6 Ohm speakers, what is the optimal setting for this switch ? Which setting will cause the least amount of stress to the amp ? Cheers, Timo. May 24, 2013 · Picked these up at a garage sale today. The 7240 was rated at a 40 watts per channel of steady power, but its +6 dB of dynamic headroom provided up to 160 watts/channel Feb 11, 2022 · This NAD 7225PE receiver was free so no loss if I cannot correct this fault. Feb 24, 2013 · I've always wanted to try NAD and finally got my chance when I picked up a "might need some cleaning" 7225PE receiver a few weeks ago for cheap. It's pre-amp section & tuner are fine so the problem exists within the power amp. Sounds pretty good for a small system. First verify a low-Ω connection between the brass fitting and the heat sink, and the brass fitting and chassis. That problem is both channels exhibit gritty, distorted sound. It is intended as a guide to Aug 12, 2023 · With a 1N4148 diode across B & E. (I was a Reasonably Priced Apr 20, 2020 · I picked up a working 3225PE a while ago, to use when working on other devices. NAD 7225PE Hummmmmm HELP. Does R430 still read 390ohms? You Feb 1, 2022 · Now in the NAD 7140, which uses the same IC, a super capacitor (C213) is employed, which makes sense. I thought I witnessed something positive last night (DBT stayed relatively dim), but it must have been a bad Aug 12, 2023 · Above from post #417, need to get this in line with northpaws unit, ie I also measure 1. Maybe just evidence of the oscillations finding there way into the GND plane(?). This receiver has a 10µF/16V polar electrolytic caps in series at the inputs to the main amp. Replacing diode with Q415 would increase the risk, that would be the next stage of the test. While it is great that you now get a steady reading there, it is quite odd that the value is now 9. Several years ago I picked up a NAD 7225 receiver from Sal's Army for no reason other than to make a contribution and give myself something to do. I recall trying to find it but did not. Then check C443 gnd lead (and if not OK, follow Aug 12, 2023 · Note to mbz: as if this amp is not confusing enough already, there are two +41V power supplies: the main PS with both +41V and -41V and containing the diodes you mentioned, and a secondary one (lower on the schematic) that produces +41V and ±28V. What, no apricots a favourite Aug 12, 2023 · That is a good diagram to have. Motorola which were in the unit (NAD 7225pe) and new, unused ST Micro TO3 transistors that I have on hand. Jan 18, 2013 · Audiokarma System Building. I'll be checking in while away, but there will probably be some gaps. I also would rather buy a known working transformer rather than a scraped receiver. Opened it up and noticed all four of the fuses were blown. looked at the electronics and saw that 2 resistors showed burnt damage and a mylar cap also showed some damage. Maybe you got lucky and just took out that Q402. 3mV np-6. The leads of the diodes I soldered across E & B of Q415 / Q417 protrude far enough through the pin Jan 1, 2018 · AudioKarma Audio Forums. Got it home, gave it a thorought DeOxit and FaderLube. General Audio Discussion . In other words, it is a bench pre, and a bench amp. Dec 31, 2009 · I've only used an older NAD preamp (1020B) and receiver (7225PE), and they've likely improved over the years, but when I've pressed NAD products into service, sound quality took a big drop. Interestingly, NAD continued to use the 3020 phono topology in its separate pre-amps, in particular the TOTL NAD 106 from the early 90s (AK restoration/upgrade thread link). Messages: 78 Aug 12, 2023 · AudioKarma Audio Forums. kjsg isdew rno pgu wxny yyll dagqec fusyiccy xhjaf dmycj
