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Hi Rafaecorp, You might apply "+" to Pin 14 and "-" to Pin 15 for the 1st time. then do it again with reversed polarity ("-" to Pin 14,"+" to Pin 15). Jack

I have tried to find a good replacement for STV-2H-O(orange dot) just in case I might need it one day. The best Ｉ have found so far is HER 105 which meets the specs of Vf range of STV-2H-O: The Vf of STV-2H-O(@If= 7mA): Vf_min:1.07 V Vf_max:1.15 V Scanned 10 smaples and got the average Vf...

After adjustment the idle currents now are about 68mV on both channels. ---------------------- Before ---------Now Lch idle current: 106mV ------->~68mV(specs:70mV) Rch idle current: 60mV -------->~68mV(specs:70mV) Power consumption: 70W ------>~62W (idle mode,no input/output) Temperature of...

Correction: From above data the actual power consumption was at least about 6.32W higher than normal: ((actual idle current_R+idle current_L)/0.94 ohm)*2*110-((70mV+70mV)/0.94 ohm)*2*110V)=((107+60mV)/0.94 ohm)*2*110V-(70+70mV)/0.94 ohm*110V=6.32W This means if the idle currents on both...

Today I did few more measurements on the SA-9800 with higher idle current on the Lch.those data may help someone who wants to know more about SA-9800.the measurements made with top case opened,the room temperature regulated by an air conditioner...

Well done! Thanks for sharing how you did it with us.

The SA9800 with dim VFD had been sitting on the shelf for over 6 months before I took it off the shelf couple days ago, after many short warm-ups it's now ready for test. The 1st issue I found is the standby power consumption too high 113Vac/0.790A/70W about 7W(10%) higher than normal...

Very useful information.well done!

Couple days ago I figured out how to measure the electron current emits out of the filament,I tested it today on a Samsung VFD, the Ife curve trace explained why a higher Vg makes VFD dimmer,because Ife is not always increasing with Vg(Grid Voltage). I will do same test on VFDs of my SA9800 soon.

Congratulations! Now we have three successful cases.soon we will be able to find a better and safe way to proceed the VFD rejuvenation.

(5. VFD Rejuvenation) 5-b.Rejuvenated VFD: Before and After Finally I got everything I needed and proceeded this experiment,fortunately I succeeded! the result is good,it's much brighter than before and close to normal,but it's still a little bit dimmer if compare with my another SA-9800.can...

5. VFD Rejuvenation: There is a chance that my dim display could be saved by moving the ash(or oxidization) on the surface of filament(if it's the cause of my dim display).the high temperature can vaporize or shatter the ash and reveal uncovered filament.I am going to try it this week...

4.Replacing Relay: The contacts of the Omron relay(MY2-J 48VDC) is dirty(the DC contact resistance sometimes >0.5 ohm),it caused weak R-ch and distortion. I replaced it with a Idec relay (RM2V-U DC24V with a 48DCV coil),it passed my contact resistance test before I install it in the SA-9800...

I am repairing my 2nd SA-9800,this one has dim display,dirty relay contacts and couple poor SW contacts. I am gonna fix them as many as I can. 1.Standby power consumption: Main------Current------ Watt(true power) 113.8Vac ~0.710Aac ~60.5W(before relay tripped) 113.5Vac ~0.730Aac...

Rejuvenate the display! One of my three SA-9800s has a dim display too,I am gonna try it.

First,check the voltages on Indicator board AWV-002 (VFD display board) 1.Between pin 14 and 15 (ACV): (it should be ACV 4.0~4.3). 2.Pin 10 to GND (DCV): (normal dim:~38Vdc,bright:~30Vdc)

You are right! thanks for your information!

According to my limited experience the fake MT-200 Trs I have ever seen are remarked, I bought 10 pcs of 2sa1076 from a China Taobao seller few years ago,the trs I received are different from the trs on the pic posted by seller. they are remarked.later I returned those trs and got my money back...

Which output transistor do you need? 2sc2526 or 2sa1076? both are available on ebay. https://www.ebay.com/itm/2SA1076-160V-12A-PNP-Power-Transistors-A1076-MT-200-FUJITSU/112766188864?epid=2131498349&hash=item1a41637d40:g:EgkAAOSw9p9aY0YC I bought 6 pcs of 2sa1076 from above seller last year and...

Repaired my 3rd Pioneer SA9800 last week,after replacing the 48Vdc relay and cleaning all VRs and SWs it works fine now.what interested me is the driver and output trs replaced by A1306A/C3298A and A1301/C3280 on Rch of Power Amp. I checked the frequency responses(vs gain and phase) of both...

In order to narrow down the source of the hum/noise the pics of the signals of pre-out,power AMP out and speaker out( no input signal/min Vol) on scope may help.if the frequency of the hum /noise is 60hz then power supply/or ground might be involved,try 0db/-20db switch on face plate if the...

The cover of the relay could be pried open(look for the small holes on both sides,close to bottom),after that you can clean the contacts,

If you suspect the AWM163 board to be the cause of the noise and hum then you can make a test, bypass it by connecting power output directly to earphone socket(you must disconnect the earphone socket from AWM163 board),by listening to the earphone you will find out the result in just few...

A story with a happy ending!