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KT150 pp amp operating points please
KT150 pp amp operating points please
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Old 20th June 2018, 12:41 PM   #41
kodabmx is offline kodabmx  Canada
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The datasheet states 100 watts from 1 pair of KT88. They do not "break a sweat" at that level. You can even get 150W for speech/modulator service (Class B triode). Even a pair of EL34 will make 100W. You can get 200W from KT150.
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Old 20th June 2018, 03:53 PM   #42
waltube is offline waltube  Italy
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This just to remember

P-P with EL34/KT120

It is with 120 but the 150 works the same

Walter
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Old 20th June 2018, 07:14 PM   #43
kodabmx is offline kodabmx  Canada
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This is very true. Much less money, too. I have a feeling it's the egg shaped bulb that attracts the client.
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Old 20th June 2018, 07:52 PM   #44
Pano is offline Pano  United States
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KT150 pp amp operating points please
Let's see.
Customer: I want an amp with KT150 tubes.
diyAudio: No you don't!

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Old 20th June 2018, 11:18 PM   #45
multi is offline multi  Australia
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I saw this on another thread on this site forgot to book mark it

KT120-KT-150
Hello, I am running SE-monos with KT150@50W anode dissipation. What I do see is a dull red glow of the anode in the pin 1 area, the attached picture shows it quite nicely. I do own 4 KT150s, they all show the same behaviour, in both amps. KT120s with the same dissipation settings, however, do not show any signs of anode glow. Did anybody owning KT150s notice a similar behaviour? Would not really like to challenge mine with the rated anode dissipation of 70W.... Thought I bought them from a reliable source, do who knows ? Or this is a KT150 feature, not a failure - they accumulated at least ~150h so far quite happily... Any hint is very much appreciated!

Marcus

Attached Thumbnails

Has anybody wondered why the manufacturer has not published reasonable specifications ?
These are not sufficient at all: http://www.newsensor.com/pdf/tungsol/kt150-tungsol.pdf


Hi All,
Yes, as Bruce says I had four KT120s that showed red at 60 watts total dissipation right out the box. I then returned these and swapped them for 8 x KT150s and of these:

-4 work with no red showing but of these two have quite deformed glass bulbs
-4 were defective. 2 of these showed red, while of the other pair, one made loud cracking noises out the box and both valves in that pair could not be balanced for dissipation.

So quality is a serious issue with these Russian tubes. I have had similar problems with Electro Harmonix and Sovtek output tubes too. Strangely enough I have had no problem with their small signal tubes.

I will continue to get these tubes from a sympathetic dealer who replaces them and credits return postage if there's any problem until I get satisfactory tubes.
David
Hi all,
seems that indeed the manufacturing quality is not entirely stable. Would also guess that missalignment might be the issue. If I change my KT150s for KT120s with the exact same settings (460V/110mA) there is no indication of any red plating..might be unlucky with my 150s, but lucky with my 120s
Marcus
supposedly Shuguang makes KT120's.

Treasure KT120-Z CB @ $262.00 per pair.

Not ready to jump on that boat just yet.

Stu
Hi, To add to the fury.... A licensee in the UK of some of our company's designs has reported the same thing. The tubes are used in push-pull with a CCS and are well within spec. Red anode stripes and glow are being reported on KT120 and defective tubes (new) right out of the box for KT150. This does not inspire confidence. Our company had initial issues with the distributor elsewhere mentioned but apparently that has been resolved after we kept send tubes back.
Attached Images
File Type: jpg kt150@50w.jpg (249.8 KB, 71 views)
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Old 20th June 2018, 11:20 PM   #46
TonyTecson is offline TonyTecson  Philippines
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KT150 pp amp operating points please
Quote:
Originally Posted by kodabmx View Post
This is very true. Much less money, too. I have a feeling it's the egg shaped bulb that attracts the client.
there are those who would like to try anything new...tubes included...
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Old 21st June 2018, 07:14 AM   #47
waltube is offline waltube  Italy
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I have got some issues with KT150 about 3 years ago.
The lasts I used, 16 pcs, are running fine int the last 6 months without any problems.
I think that in the beginning some trouble they have had.

Regarding the egg shape that can attract clients the question is simple.
If you have used the 150 or if you haven't.

And there is a great difference.


Walter
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Old 21st June 2018, 11:59 PM   #48
stocktrader200 is offline stocktrader200  Canada
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I am thinking of building something like this with 6922 or 6H30 driving MJE15030 type output transistors instead of 6C33. this effectively make the output tube a 6922 / 6H30 which both have excellent curves. A 6H30 could yeild close to 100w with 4 transistors per triode.
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Old 22nd June 2018, 02:27 AM   #49
kodabmx is offline kodabmx  Canada
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The 6N6P is a good middle ground between the two...
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Old 22nd June 2018, 07:14 AM   #50
waltube is offline waltube  Italy
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I used 6N6 and 6H30, the 6N6 is in second place respect 6H30 but better than ECC99, another good tubes for splitter.
In case 7044, 6463 or 6350 are other choice.
I used also a ECC81 in Srpp for first stage with a good results.

Walter
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