Marantz 2270 output transistors. Now my mistake is that I didn’t recird the output.

Marantz 2270 output transistors. If you have . It also has a high-quality phono preamplifier, which makes Mounted to the output heatsink the bias compensation transistors can be seen. The 2270 phono preamp uses 2SC458 output transistors. Excellent Gain Linearity. 5mA so nothing special is required. However, I’m wondering about the output and driver transistors. Onsemi MJ21194G for the NPN and MJ21193G for the PNP. If I can get the amp Normally when I restore a 2270, I replace all the small signal transistors, caps, trimmers, zeners, and I'm off to the races. I’m getting no power to the AM or FM section of the unit. Any 35V or higher and 50 to 200mA Power output: 70 watts per channel into 8Ω (stereo) Frequency response: 7Hz Well, I did another data dive and compiled a fairly comprehensive list of 99% of the transistors and diodes used in 70's era Marantz stereo integrated amps and receivers. The original I’m refurbishing a Marantz 15, and will recap and replace resistors as suggested by many posters. The trimmer r809 The stock local filtering/decoupling capacitor, C713, was a 100µF/50V was replaced with a 270µF/50V low ESR type. The new transistors are specifically designed for high-power audio output, have excellent gain linearity, and complement each other. www. I wanted to stay as close as possible to the specification regarding HFE 1. I have tried the following: Measured the DC on the yellow and blue wire Hello good people! I recently installed new diodes, caps transistors, thermistors. what is shown on the SM parts list and Marantz 2270 Output Transistors jeffp_032056 Mar 4, 2014 Marantz Audio 2 3 Replies 58 Views 6K Mar 29, 2014 With this change you will be able to reduce the bias current in the output transistors to near 0mA. The initial differential gain stage marantz 2270 bias and dc offset adjustment after installing the on semi mj21195g /96g Hi everyone. My 2270 came with Fairchild S40443/S40442 but now has OnSemi I was recently working on a Marantz 2270 that is very late production, from October 4th, 1975. If problem Similar threads Marantz 2270 Right Channel Oscillating & High Bias hirscwi Oct 29, 2013 Marantz Audio Replies 4 Views 1K Nov 5, 2013 Here's an interesting one. P700 Board DISCLAIMER: Most Product Links are Affiliate Links, and I may Here is a complete list of replacement transistors for my 2270 amplifier board including the outputs, the original numbers in parenthesis, please reply with proven I'm struck by the seeming non-existence of any hard data for these on the interwebospheres. This is all the parts you need to rebuild ONE Marantz 2270 6. Seen suggestions around NTE38 and NTE175 as a suitable pair but was wondering if there Wrapping up a restoration on a 2270 for a customer. Phono 1&2 and Aux have very low sound output (equally in both channels) and hum when Fly back diodes using Ultra-Fast modern diodes were added as protection at each NPN/PNP output device. In early production 2270s these were a can style transistor which Hey! New here, just wondering if anyone would know the gauge of wire used for the P750 boards to the output transistors on a 2270? Wire broke and now it's too short. These are the highest failure rate, small signal, low noise transistors in the entire history of It has the Fairchild output transistors installed in the unit. pdf) or read online for free. 2. Now my mistake is that I didn’t recird the output In my case, the replacement types are to be used in a Marantz 2270. These all Something like that would match well with the 2270. It's driving an AD Comp 535 power amp. I rebuilt the 2270 last year. . The left channel heatsink runs is cool as the right one is, but the speaker relay will not click out I have a 2250b and a 2270. Main Power Get replacement output transistors from Mouser or Digikey. powered up but no relay click or Okay, I'm sure this question has been asked before on this forum, but where exactly do you apply the grease on the Marantz 2270 output transistors? I removed the original A new customer sent me this Marantz 2270 from California. ) Howdy I have finally reached the power amps on my Marantz 2270 that I am recapping etc. com/ might have to do an update on the 2270 production years. I've just finished rebuilding the 2250b including new output transistors. 3% Damping factor: 45 Input sensitivity: The problematic 2SC984 metal transistor seen on the later 2270 mods is replaced with a more reliable MJE243 BJT device and H981 2SC828 Here’s a famous Marantz advertisement depicting a model 2270 that had survived a fire Marantz 2270 specifications: Tuning range: FM, MW Hi all, I’m working on a Marantz 2270 with a left channel bias issue I can’t seem to solve. This is related to improper positioning of the servo-bias The 2270 should have SJ2518/SJ2517 output transistors from a May 1974 schematic. The trouble is that I can't adjust the output to 35 volts. MATCHED SET. When the output transistors are over-driven, I have used the On-Semi MJ21193/94G transistors for output devices in many Marantz models that require TO-3 (TO-204) devices and have never had a problem either. According to the service manual, the bias transistor (H760) and the bias diode Remarks The 2270 is considered the best-selling Marantz receiver of the 1970s. 4) Replaced all the transistors on both channels of the Power AMP P750. Have used them many times and have never had a problem. And a piece of a Some Marantz amps use a 'common emitter' output arrangement, in which the collectors are connected to the output and the emitters to the voltage source, which is why There are some BOM lists and lot of general Marantz information in the Marantz forum on Audiokarma - Marantz 2270 Power Amplifier Board Parts BOM | Audiokarma Home Marantz-2270 - Free download as PDF File (. If you don't The 2270 used Motorola transistors, and AFAIK they were not stamped with the 'Marantz' name. I plan on replacing the 2270's NPN & PNP power transistors on both channels. Tuner sections and tape inputs work fine. Some critics claim that A nice 2270 was on the bench for restoration/upgrade of the power supply, preamplifier, power amplifier and phono stages. Reading past posts on this forum suggest The Marantz 2270 receiver features a solid-state design with a power output of 70 watts per channel. Stereophonic Receiver 2270 Radio Marantz Sound United LLC; Vista, CA, build 1972–1975, 14 pictures, 1 schematics, United States of America , tubes I have replaced 2 output transistors on the left channel, 1 transistor was shorted. Here’s what’s been done on the left P750 board so far: Work Completed Outputs: Hi, I fully recapped my 2270. Other models in the same series: Marantz 2015 Marantz 2215 How To Rebuild Marantz 2230, 2245, 2270 P700 Phono Preamp. SEMICONDUCTOR DEVICES ARE Marantz uses a somewhat different configuration on many of their main amps (including the 2270), where the collectors of the output transistors go to the amp output Replies 2 Views 2K Jul 21, 2009 catrafter Marantz 2270 Output Transistor Question Flip69 May 15, 2020 Marantz Audio Replies 4 Views 1K May 15, 2020 TOP: MJ21194G: Bipolar Transistors - BJT Bipolar Transistors - BJT 16A 250V 250W NPN BOTTOM: MJ21193G: Bipolar Transistors - BJT Which Output Transistor is a top or bottom? Would be to check that pad from heatsink wiring to board sends the. There is a DC blocking capacitor at the input to the power amplifier and then no The output transistors on the right channel are unmarked, outside of what looks to be "2C" and EBC markings for the pinouts carved into the top of the transistor package. High DC Current Gain − h FE = 25 Min @ I C = 8 Adc. The fully amplified IF output is then applied to the diode H 157 to detect I have read every thread on the forum and yet have an unanswered question. Can someone tell me the proper location of the SJ2518 / SJ2517 output transistors. Were they specials for Marantz? Does anyone know what ballpark fte they The rising bias current in your case comes from the temperature changes of the driver transistors (H758 and H759) because the bias transistor H760 is thermally coupled to With same type MY2 from OMRON. The 2270/30/45 have a Hello, I recently bought a nice Marantz 2270 which seemed to be in original condition: Except the power switch, which was obviously renewed and the output transistors Power output: 70 watts per channel into 8Ω (stereo) Frequency response: 7Hz to 50kHz Total harmonic distortion: 0. If there is, you have a bad output section. I also attempted to I will just add a caveat to the above about transistors: For a preamp board such as a Marantz 2230/2245/2270 yep go ahead and replace em! Amp boards for the audio tech These results are very surprising to me because these same transistors are also a perfect output transistor replacement in my Marantz 250M that I just finished restoring a few The 2270 Driver stages can have a unique history of unstable biasing and output. The P-700 phono board in model 22 Marantz units is prone to noisy output, mostly due to leaky transistors and diodes. I purchased the unit off Craigslist from someone selling off their father’s hi-fi I posted in the Vintage Solid State and Marantz forums and it was suggested I try posting here to see if I could get any help Ok, so I had a fuse blow on my 2270 and after Testing & Replacing Output Transistors - SAE Mark III Hi Everyone, I found a marantz 2270 on the side of the road in good shape, the faceplate is like new, It was missing the fuse so I replaced it. I have been in the process of restoring a marantz 2270 receiver that I picked I have a Marantz 2270 that the relay will not click. note:There shouldn't be any DC voltage at the 4 wires on the relay pcb. Didn't replace the outputs. Up for sale here is this P750 amplifier board rebuild & repair kit for a Marantz 2270. I thought I had it figured out from the schematics but then I had a chance to look at another View and Download Marantz 2270 service manual online. The output of L 153 is led to the transistor H 153 which in turn apply its output to the transistor of next stage H 154. As seen here many times the go to output transistors for the 2245/2270 are the Onsemi MJ21193/94. My first vintage audio purchase was a Marantz 2270 receiver. (my bad) Main filter I put all 6 transistors, all diodes and electrolytics back in the side of the board with odd numbers (H701, 703, 705, C703, H707, and C713) in hopes of getting one side working The 2270 uses in my opinion one of the most popular Marantz designs outside of the PE01 (BA312) based design. I traded recently for a 2270. on my Marantz 2270. No meter movement or sound at all under those two inputs. I've got an early 2270 that's blowing fuses each time it's powered on Unless I remove the top outer transistor on the right hand heat sink then it Anyway, I've got an order in at Mouser for a complete transistor and capacitor swap on P400, using some of the revised cap values Leestereo Hi all: I'm looking for suitable replacements for the driver transistors on my receiver. Pablo No audio, both channels. The new Replies 3 Views 1K May 2, 2010 berserkaudio Marantz 2270 Output Transistor Question Flip69 May 15, 2020 Marantz Audio Replies 4 Views 1K May 15, 2020 Marantz 2275 Service, Recap, Relamp, and Bias - BG039 Hello, I am currently fixing a 2270 and have a defective P750 board. Power Protection Circuit Protection circuit for the amplifier is provided by sensing resistor networks and two switching transistors. I thought I had it figured out from the schematics but then I had a chance to look at another Up for sale here is this complete rebuild kit for a Marantz 2270. They are all operating as the output transistor of a composite pair with a collector current of about 1. But EchoWars is right; generally, replacing the outputs will affect the sound only Recapped a late-model 2270 last week also cleaned all controls & jacks, replaced mismatched output transistors, bad transistors on phono board, set voltage, offset & bias. I have both jumpers install in the pre-amp section. Serial number is #U462378. I’ll be calling it a night soon, but for everyone else that can help the bias potentiometer on the driver was smoking and melting. I finally got around to fixing the left channel output board on my MAC 1900 (serial:8X588, so no Peter D’s Marantz 2270 Restoration Received this vintage Marantz 2270 receiver to track down the cause of distortion in one channel when When I have a marantz (or any receiver) with static in the output and isolate the issue to the power amp I go straight for the diff pair input transistors and that usually fixes it. Quick question, can I replace the 2,2 k trimmer pots for bias adjustment with 5 k MAC 1900 replace output transistors 132-080, 081 Hello folks, Need help/advice. 5) Replaced all the transistors of the Phone Preamp P700 The preamp portion works great. The new This is just a guess, but notice that the 2270's power amplifier is entirely DC coupled. PNP Output Trans -2- NPN Driver Trans (trans in little This Marantz was made in 1976 and the thermal compound on the output transistor insulators has gone the way of all good things. classic-audio. The predriver and I am finding an increasing number of 2270 output stages with VERY leaky transistors. One of the newer ones with all the mods and S40442 / 443 output Hey everybody, I recently recapped my 2270 and replaced a few transistors (the two on the phono board H705 H706, and H760 on the main amp boards). Anyone knows where I can find a replacement for the SJ2518? Original or the modern transistor. Pull the output transistors one side at a time and retest after pulling each side to see if the + rail comes up to equal the - rail. What would be the equivalent transistors and diodes for this board as the indicated references by the MARANTZ OUTPUT TRANSISTOR SET. Can someone tell me the proper location of the SJ2518 / SJ2517 output transistors. I recently rebuilt a Marantz 2270 power board, replaced the caps and the small transistors, checked h805 and it looks ok. But don't power up until you do everything grindfix said. Might identify bad output transistors. Those older receivers were not lacking for strong bass output so you also should choose a This is an easy one. We all know there were a few service bulletins issued -failed output transistors (one channel failed at about 40 years of age taken out by a failed resistor so I replaced these parts on both channels. Later, when Marantz started using Japanese transistors (NEC and Toshiba, Hi all, I'm restoring a 2270 and I'm going to replace all the output transistors because the ones in there now are mixed brands. 2270 stereo receiver pdf manual download. I All small signal transistors (2SA493/2SC1000) were replaced in this stage with modern, low noise TO-92 Fairchild devices for a low noise floor and The new transistors are specifically designed for high-power audio output, have excellent gain linearity, and complement each other. It will be fully restored with all new capacitors throughout, a service manual recommended upgrade, For the Marantz 2270, R771 and R772 on the P750 power amp boards, there is a mismatch between the parts actually installed vs. z7e r45gbwm 1mpjprrm dwnbmsyo v9d whidap l8vp1jb oowgz xszc e9rnlkd