hello i just got 2 gz shuguang gold rectifiers im about to compare an old one to see if i can hear a difference but im told they are rugged im using them for a guitar amp so seeing this post interested me.but ive got no equipment to try this sort of thing out or much knowledge i just trust my ears & analogue is king great post mate peace....
I have a Full Music Mesh plate/grid 300b tube. Working fine, not many hours and then one day I turned on the amp and nothing. Very disappointing. The mesh plates are nice sounding and look wonderful.
Hi, thanks for your comment on my video. I have never tried it so I don't have any idea about it. But regular tubes have excellent electrical spec and capabilities to reproduce right sound. This is all I can say. Have a great day. Young
Am I the only one who thinks that TV7 box looks amazing? All the analog dials and buttons. Young, have you considered making an analog, modular, synth?
Excellent video ! Can you give a little more details on how is this working and what are the perfect voltage conditions for heating and time (I saw you put a little bit more than the normal value, aswell for the 45's you also rejuvenated). Thank you for the sharing of this excellent knowledge !! Now I know that I won't ever throw a "bad" tube anymore !
good afternoon dear Fernando. Thanks for your comment. It depends on. If a tube is in good condition with just simple emission issue, it takes 3~5 hours is OK. But some tubes which were used for long time with overload, it takes 24 hours or more. Sometimes it is a small amount of improvement only. voltage is same as the original spec. Have a great day. Young
Wonder if this would work on a "Zombie" tube where I accidentally did something similar: heater was at 9V for less than a second. Stupid I know but visible light emission is very low compared to another identical tube under same bias etc. I did hear that emissive coating damage is supposed to be irreversible but maybe not, plan is to try a variant of this where negative voltage is applied with tube at +170 Celsius so the coating is persuaded to re-coat the now cold heater by a variant of sputtering as this is essentially how it was applied at the factory. Might work on age weakened VFDs as well which would be excellent!
Wow, I’m very surprised that works! It would seem like while you’re stripping your heaters you’re building a layer on your cathode, AKA cathode poisoning. I wonder if there is a way to heat the tube to fix this rather than apply heater voltage that long. I suppose if a tube is dead, one is less concerned with shortening its life🙃.
Hi, great video. I have a custom 12 X 6550 (kt88) amp that red played all its output valves very quickly. The amp was turned off very very quickly, I turned down the bias pot and tried again. Although not going into red plate again, the power output was much less. The valves were all with less than 24 hours use. I suspect a capacitor. I am wondering if I might need to go through your process. I don't want to buy 12 new matched valves! I'm hoping the valves weren't taken too far and can be salvaged!
it is a regulated power supply, in this case it gives a voltage of 5.3 volt to the filament of the tube and the filament withdraw a current of 1.3 amperes
The tube was damaged. It was NOT a tube that lost it's ability to conduct from old age. You cannot revitalize a vacuum tube unless you disassemble it, replace the filament (or cathode if equipped), put in a new getter material, and then re-vacuum, seal, and initialize the getter to remove unwanted gases.
What do you mean by "burning filament for 2 hours"...? 3:23 How do you "burn" a filament...? How much voltage are you putting across the filament...? How does this give a tube back it's life...?
Dear Mr. Ahn: I have a question; years ago, 1 of KT88 burnt out , among 4 tubes in my amplifier, the tube it burnt, the element lighting up abnormally, just like fire, I turned offy amplifier immediately. Would that burnt tube burn out the amplifier and speaker too? Looking forward to your advice🙏
happy new year dear James. It does not damage your amp or speakers because OPT blocks DC. If an OPT has insulation issue, it's another story. I like James Wood, a famous movie star
저의 채널 구독해 주셔서 감사드립니다. 동일합니다. 제가 가장 최근에 올린 45에 관한 영상도 보셨을텐데요, 2개중에 한개는 거의 기준치 안으로 회복되었습니다(거의 이틀동안 달궜슴), 하지만 다른 한개는 몇일을 달궈도 잘 회복되지 않았습니다(40프로에서 60프로). 반면에 슈광 2A3는 에미션이 완전히 감퇴되었었는데(TV-7에서 0) 원래수준으로 빠르게 회복되었습니다. 한번 시도해보세요. 그럼, 다음에 뵈요. 세영
It's because of high plate current caused by 0 bias(short circuit between filament ~ GND). No plate current at all after my mistake however the 300b tube was revitalized by supplying 5V for more than 10 hours. This method eliminates invisible gas layer which are concentrated on filament. watch my video again, you can save lots of money
email ありがとうございます。私は 趣味で アンプ 作っています。そしてaustraliaでわはんばいできないです。そして運送りょきんもダイヘン高いので米国のぞいてはばんばいするのは難しといえます。If you are serious on my product, please let me know the model number. I will do my best sir. Thanks for your interest. Have a great day. Best regards. Young
@@YoungAhn Youngさんの日本語分かります。色々な言葉ができてすごいですね。240Ⅴの製品を作るのは簡単ではないのですね？希望は100Vと240Vがスイッチで変換出来る物です。120Vでしか作れない場合には変圧器を使います。ケースはWoodを希望。SP302WWにt着いているbias test meter : easy to test tube conditionがとても気に入っています。Youngさんが作っている多くの商品が欲しいですが今は一つしか買えません。色々と考えて頭がいたいです。色々考えてまたご連絡します。 運送の事は解決しました。もし商品を注文したらアメリカに送ってもらいます。
