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Harman-Kardon A300 6L6GC/5881 power tube upgrade

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I'm upgrading the 6V6GT tubes in this amp to 6L6GC due to the high plate voltage used. I'm going to install an external filament transformer to handle the additional filament load. PLEASE NOTE: I have found the 6L6 tubes will not work in this amp, they draw too much plate current for the power supply to handle.

Channel: Science & Technology
Uploaded: November 30, 1999 at 12:00 am
Author: retrochad

Length: 07:44
Rating: 5.0
Views: 3626

Tags: Harman-Kardon  A300  6L6GC  6L6  6V6  7408  5881  power  tube  upgrade  amplifier  amp  tubes  

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Video Comments

JimBrinkley1 (November 30, 1999 at 12:00 am)
I have a two-piece '48 SCOTT Model 800 Hi-Fi FM/AM/SW that has the green tuning eye. The amp has about a dozen tubes alone. Needs restoration. Any collectors interested in it give me a shout at antmeeks60 at yahoo.com and I'll send you photos.
71chevyvan (November 30, 1999 at 12:00 am)
thanks for the interesting video of our similar HK a300"s w/o a tube manual in hand i ask you if there's a notable diff in impedance between the 6l6/6v6? i have replaced the coupling caps and aquired a pair of advent model #1's spkrs. i do love the sound barry
musherX (November 30, 1999 at 12:00 am)
This rules ! Thanks for you wonderful videos.
badboyfreaky69 (November 30, 1999 at 12:00 am)
You cant see it, but I can hear it. A well balanced amp is the trick for me. Prp 9372 films , shinkoh tantalums in a few select locations and nos allen bradley carbons on my grid stoppers. Dont get me started on caps, although I do like the russian military stuff , specially the teflons and oilers. Yes I use silver milspec wire to. It all makes a differance. Satisfaction for me. A hobby a job and a passion. My 2 cents.
cobraopts7 (November 30, 1999 at 12:00 am)
ive got a 1977 peavey classic 100 and it uses 6l6gc tubes and i think they were the origional tubes cause peavey doesnt even makes these tubes anymore al im asking is whats a good brand and what tube sounds the best for metal im new to this tube thing
starlite2991 (November 30, 1999 at 12:00 am)
chad, what is the tune your where playing "chrish is the word dong dung....
gmcjetpilot (November 30, 1999 at 12:00 am)
@badboyfreaky69 Tubes are tubes and people blow money on tubes like silly people. Match paired? Yea they make a small difference in a push pull but it is also a marketing gimmick. I could do a test and see if you could hear the difference. You could not. If you can prove that telefunken tubes are better or matched pairs are worth the hype and money I would like to see it. Why would any one use their amp every day? Why not? You are talking propaganda and myth not engineering.
badboyfreaky69 (November 30, 1999 at 12:00 am)
By the way the telefunken preamp tubes you probably have in there are worth alot of money and for a good reason. This is not a cheaply made amp by any fetch. I have two identical HK receivers that are undocumented, using basically the a-300 award output section. They sound amazing with the JJ 6v6s.They will be with me at my grave or in my childrens hands when im gone. The HK engineers cant even find the documentation on them! made for console installs? I wish to contact You in person. AARON
badboyfreaky69 (November 30, 1999 at 12:00 am)
Chad may I suggest a matched Quad of JJ Tesla 6v6 spiral filament tubes from antique electronic supply. Although not published they can take 500 volts on plates without even the slightest hint of cherry and sound amazing to me in my HK receiver.
badboyfreaky69 (November 30, 1999 at 12:00 am)
I know why someone would use this amp daily, it sounds awesome, period. The sound is very dynamic due in part to its cathode bias and has a wonderful singing quality with the 6v6 / 7408 tubes, let alone the telefunken preamp tubes which are worth gold themselves.


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