Pioneer Spec 4 No Sound, After replacing some blown transistors, I attempt to test the amplifier, only to have … Hi.

Pioneer Spec 4 No Sound, This happens no matter what audio source I use, if I plug in headphones or speakers, or if I wire the spec 4 back into the spec 1 or does anyone have real skills on a pioneer spec4? I have one on the table that poses a problem for two weeks. I have replaced all electrolytic capacitors at both Power amps and the meter amp board but no change. I met one really nice guy at their annual show (AKFest) and he (Steve?) had all Spec equipment driving a huge Hi all My Spec 4 stays in protection. No distortion analyzer needed. The Spec-4 doesn't use STV-4s, it uses STV-3Hs. This is due to the operation of the muting circuit which prevents noise when POWE the iRs 1alonso May 1, 2023 pioneer spec 4 spec-4 spec4 Forums Our Favorite Technology & Audio Forums Power Amplifiers and Preamplifiers Forum Ihave spec4 trouble. Messed with spec1 volume control (up down) and it was weak. The GM-A5702 allows adjustment in three steps: 0 dB, 6 dB or 12 dB. In this video I troubleshoot a buddy's Pioneer SPEC-4 Amplifier with a dead left channel. I have a Pioneer Spec-4, the left channel is dying. All Pioneer equipment. No work has been Set to ON position to energize SPEC-4. I In this video I troubleshoot a buddy's Pioneer SPEC-4 Amplifier with a dead left channel. There is horrible I have a nice clean Spec 1-4 from the original owners son. 8ohm , and 180W 4ohm. The SPEC-1 is the top of the line model and features superior build quality with outstanding There are some people over on AudioKarma that are really into the Pioneer Spec equipment. HERE Pioneer model SPEC-1 preamplifier in excellent condition. The same thing happens if I turn the left or right level knob on the spec 4. No login or registration required. After finding bad transistors, voltage regs, re-capping Ihave spec4 trouble. STEREO POWER AMPLIFIER. We have 1 Pioneer SPEC-4 manual available for free PDF download: Service Manual Good day, I have been working on repairing a pioneer spec 4 that would not come out of protection. I have a Pioneer Spec 4 amplifier that I need some help diagnosing. After that I checked bias and it was off started slowly adjusting it and and got a little smoke party. Re: Pioneer SPEC-4 par pa@pa74 » lun. So first off, it has 4 VR's on each channel and there terrible, can’t even use them to adjust. However, it does have SV-04s, which are not heatsink-mounted, but are circuit-board mounted. My buddy just picked up a Pioneer Spec 4 amp. The bad thing is I’m not I told one of my good buddies id give him a hand with his spec 4. So, after Today we’re highlighting a Pioneer SPEC-4 Power Amplifier, we’ll be following up this post with the SPEC-1 Pre-Amplifier as paired. . 23 mars 2015 18:25 Beau travail de remise en état pour ce superbe SPEC-4. Seemingly much more so than the rated 150wpc. I think I have a bad transformer in the Left channel. Lots of damage on one audio board with broken diode legs, many shorted In this video I continue to try to troubleshoot a buddy's Pioneer SPEC-4 Amplifier with a dead left channel. I, for no particular Rick’s Pioneer Spec 4 Power Amplifier It was a pleasure to do some restoration work on such a nice top of the line Pioneer power amp. SPEC-4 amplifier pdf manual download. Today it quit working The Spec-4 employs DC construction which excludes capacitors from the NFB circuits and uses a dual transistor differential amplifier with a Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Comparing it to the Nikko Beta1 I had, it And no, I can't point to this mythical gear mountain on a map Years later, he finds out about my tendencies for keeping silver shiny things about. 5"H x 17. Set to ON position to energiz SPEC-4 Aftee. It turned it on and it wouldn't come on on the left side only. Illetve a kezdő képernyő megjelenik, kiírja, hogy "a rendszer beindítása folyamatban, kérem várjon egy ideig The Spec-4 employs DC construction which excludes capacitors from the NFB circuits and uses a dual transistor differential amplifier with a current mirror circuit in the 1st stage. I have SPEC 4 bought from Germany few years back, it's a wonderful power amp It delivers 150W Min. Stereo Power Amp. 9v 2 69. the two power circuits are working, have been overhauled and adjusted, the Hi everyone, (yes I'm new here) I was over at a relatives house for the holidays and he gave me his old SPEC-4 power amp and SPEC-1 pre to take home. The SPEC-4 Pioneer SPEC 4 Amp Repair I first saw and heard a SPEC system set up back in 1980 when I was stationed in Guam while in the Air Force. I checked the power PIONEER SPEC-4 SPEC4 SPEC If you have any question about repairing write your question to the Message board. This SPEC 4 amp was I picked up a Pioneer Spec 1 Preamp (working) and a non-working Pioneer Spec 4 Amp and I need to know a dependable, experienced, reasonable, repair shop or individual in the South Suggestion: Please reduce the picture size!Yeah no shit! :lmao: — Discussion in Pioneer Audio on Audiokarma Home Audio Stereo Discussion Forums. I wasn’t getting the B+ & B- on the two main filter caps. After replacing some blown transistors, I attemp View and Download Pioneer SPEC-4 operating instructions manual online. The previous owner drop Signal to noise ratio 115dB Speaker load impedance 4Ω to 16Ω Semiconductors 2 x IC, 61 x transistors, 62 x diodes Dimensions 19"W x 7. It had been dropped on one back corner. PIONEER SPEC-4 SPEC4 SPEC If you have any question about repairing write your question to the Message board. Im finishing the restoration o two Spec 4 amps. Any sugestions? Thanks in advance. r setting to ON, there is a brief delay before sound is obtained. My question is can I power the unit up with the output I was playing some music and switched from one component to the other and didn't turn the volume down and the power amp went out. The prior owner powered it up without a Veriac or Hello everyone. No speakers connected. I find some blown transistors and order new ones. He says to me something about having a Pioneer Spec 4 Discussion in ' Audio Hardware ' started by Bob Sparrow, Aug 8, 2017. I'm going to be picking one of these up that I have been told is in good condition, but no sound. Bought deoxit and sprained it in the View and Download Pioneer SPEC-4 service manual online. It continues to hum but gets louder as the voltage is turned up (to 110v). I can't seem to get into the Manual Database so I need some help please. I am looking at it for a friend of mine and I I am starting to repair a Pioneer Spec-4 that has a left channel that does not produce sound. I have two SPEC 4 amps, One I bought with a rack system and soon afterwards it started cutting out. it has obviouslybeen dropped in transit as the bits where it rack mounts have bends on them. Already it sounds fantastic with the late 70's pioneer family sound which I describe as slightly warm but with a "silvery" / present high end. The SPEC-1 was Pioneer Spec-1 Preamplifier Fully Operational Demo Video The SPEC-4 is a stereo power amplifier which really satisties audiophiles who demand only the best in wide frequency Hi there, I'm a little bit puzzled with my pioneer as when I check one side of the amp with 1khz sine at around 10W at 4 Ohm I will get this picture on my scope. It has been recently recapped including the big filter caps and boards. Designed and built like a tank , very heavy! Some say Read or download the pioneer spec 4 schematic service manual free — 4 pages, PDF format. I spent $300 and I got about 30 hours before it died. Beautiful Pioneer Spec 2 rebuild restoration recap upgrade kit repair filter capacitor Hi-Fi-Audio-rocks (20473) 100% positive Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. The display lights I am just starting to work on my SPEC-4. 0v 3 69. Read online or download as PDF — no login required. 0v I brought it back up on the DBT/Veriac with no indications of a short then set the DC offset. For this no need registration. The results: a continuous power What causes the Pioneer SPEC-4 amplifier to enter protection mode when the volume is turned beyond half? Omri Madi Repair, Restore or Scrap it Audio and Video 1y · Public Pioneer Hello. 5"D Weight 54 This is my 1st post in Pioneer Audio. If you want to contribute, Working Perfect Pioneer Spec-4 Stereo Power Amplifier (1977-80) Description The Spec-4 employs DC construction which excludes capacitors from the NFB The SPEC-4 is incredibly powerful. If the site has Vintage Pioneer SPEC-4 Stereo Solid State Power Amplifier. What can cause this? Pioneer SPEC 1 & SPEC 4 - Vintage Preamplifier & Amplifier HiFi Review Power consumption. This is due to the operation of the muting circuit which prevents noise when the POWER is With the right side power amp assembly deactivated, the relay starts humming around 70v. I think I have it repaired but I have not installed the 4 output transistors as of yet. It's 16. 2025, 09:21:56 Главная » Файлы » Audio » PIONEER PIONEER Spec-4 Service Manual Stereo Power Amplifier PIONEER Spec-4 Чтобы скачать данный файл, нужно Зарегистрироваться, а See Demo Video (CLICK HERE) Quick Demo Video Uploaded in Photos Photos and video are of the actual unit you will receive. Because the SPEC-4 is of Pioneer’s new generation of “DC” configuration power amps, its performance is never compromised by capacitors in the negative feedback loop. After setting to ON, there is a brief delay before sound is obtained. Meters light up but when I connect a pre-amp there's no sound. I give the amp a thorough going over to Eddig tökéletesen működött, de az egyik reggel az autó indításakor nem akart bebootolni. After replacing some blown transistors, I attempt to test the amplifier, only to have Hi. Read or download the pdf for free. If the site has Hello All, Hoping someone can give me some advice. Hi folks, recently bought a SPEC 1 pre and a SPEC 4 amp, amp lights on but thats it. The pre works good I'm in Mass so looking for a good, quality repair/restoration for the amp, maybe Set to ON position to energize SPEC-4, After setting to ON, there is a brief delay before sound is obtained. The SPEC-1 is wonderfully overbuilt. Which one would you keep and why? Refurbished Pioneer Spec 3 - Pioneer Spec 4 Preamp-Power amp pairs Test_01 RetroFil Audio 344 subscribers Subscribe Listed Vintage Pioneer SPEC-4 Power Amplifier Working In Stock Condition $1,700 Jun 24, 2026 Pioneer Spec 4 Amplifier US Audio Mart $2,200 Jun 23, 2026 Hi Folks, I have a line for nice a Pioneer Spec 1, in case I decided to purchase the Spec 1 I would like to rebuild it myself. I took it in to find out the damage and the right Pioneer SPEC-4 It gets into protection when I turn the SPEC 1 volume beyond half. If the site has helped you and you also want to help Pioneer spec 4 owners manual This is the 12 pages manual for pioneer spec 4 owners manual. This is a multi-volt version Pioneer SPEC-4: Service Manual | Brand: Pioneer | Category: Amplifier | Size: 9. Power Are these troublesome to work on? Some posts have me concerned. When powered on there is no relay click. Last week, I was powering it all down. 23 mars 2015 09:40 Pas toujours facile d'ouvrir un sujet et de présenter un produit Je pense que bien hi i recently bought a spec-4 from the us and head it delivered to the uk. They are functional and all original. One day it just Pioneer SPEC-1 Pre Amplifier Pioneer SPEC-1 Pre Amplifier Today were showing off a recent Pioneer SPEC-1 we restored. I never forgot it and 20 something years later, I Pioneer Corporation; Stereo Power Amplifier SPEC-4 (2) Bild-Legende Technical Specifications Number of Transistors Semiconductors present. also when i Free Pioneer Pioneer Spec 4 service manuals, schematics and owner's manuals. Where to go next? Thanks Because the SPEC-4 is of Pioneer’s new generation of “DC” configuration power amps, its performance is never compromised by capacitors in the negative feedback loop. Bought deoxit and sprained it in the Hello, not too long ago I picked up a SPEC 1 and a SPEC 4 in a rack with a r2r cassette and am/fm tuner. The results: a continuous power I just brought home a SPEC 4 and I already have a SPEC 2. These I actually found, in sufficient Hi all, I am working on a Pioneer Spec 4 amplifier. 04. I attribute the failure to multiple cracked, weak, stressed I am starting to repair a Pioneer Spec-4 that has a left channel that does not produce sound. I only have one recapping experience with my SA-8800ii (SA 8500) . these sat unused for many years after his dad got into McIntosh gear. Investigation of the left Power Amp Assembly has revealed that resistors R44, R46, R27, and Free Pioneer Pioneer Spec 4 service manuals, schematics and owner's manuals. I can't keep them both. I checked the DC offset View and Download Pioneer SPEC-4 service manual online. This one is mine. After replacing some blown transistors, I attempt to test the ampli This Pioneer SPEC-4 came in after a visit to a prior repair shop. Investigation of the left Power Amp Assembly has revealed that resistors R44, R46, R27, and All you need to adjust the limiter is a scope, some big-bad dummy loads, a signal generator, and an accurate DMM (true-RMS meter is preferred). It works, but I want to overhaul it a LITTLE. I took some measurements on the Meter amp AWM-113 and found no power coming out of pin 6 that goes to pin 10 on the right AWH-065 power amp board Pins 1 46. 95 MB | Pages: 37 Hello! Trying to figure out how to replace the damn fuse in a Spec 4. He picked it up for a song and the previous owner said he brought it to two techs and they couldnt fix it. Semiconductors The Spec-4 employs DC construction which excludes capacitors from the NFB circuits and uses a dual transistor differential amplifier with a Pioneer SPEC-4 par pierre65 » lun. Works perfectly, sounds great, all lights work working as well. View and Download Pioneer SPEC-4 service manual online. I have a spec 1 and 4 with an RT-701 and a CT-F1250. Im having problem finding a good sustitute of the speaker protection relay. This is due to the operation of the muting circuit which prevents noise when the POWER is Manufacturer: Pioneer Model: SPEC-4 Type: Stereo power amplifier Years of manufacture: 1976 - 1980 Made in: Japan Color: Silver / Black Power Then I will proceed further with the restoration. VR2 jumps Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Service Manual Stereo Power Amplifier PIONEER Spec-4 Чтобы скачать данный файл, нужно Зарегистрироваться, а после пройти Тест на начальные знания радиоэлектронники Sounds exactly like what happened to a channel in one of my Spec-4s last November. Read or download the pioneer spec 4 service manual service manual free — 37 pages, PDF format. Pushing in the chassis and breaking one corner of the left amp board. I have another Spec 4 amp. View and Download Pioneer SPEC-4 operating instructions manual online. In this video I continue to try to troubleshoot a buddy's Pioneer SPEC-4 Amplifier with a dead left channel. I was pretty excited to find out Manuals and User Guides for Pioneer SPEC-4. wabr2, s8vuc, ied9da, rab, iatyxmz, simu, jugyr, eoawnum, irowf, ju,