| Author |
Message |
Jeff
Guest
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 Posted:
Mon Oct 24, 2005 3:52 am Post subject:
Can I use 6550A in Amp made for 6550C |
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I am interested in changing tubes in a 6550 amp to GE 6550's
is there anything that has to be done to the amp first or are they
interchangeable
thanks,
Jeff
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Jon Yaeger
Guest
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| Posted:
Mon Oct 24, 2005 3:59 am Post subject:
Re: Can I use 6550A in Amp made for 6550C |
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in article RuU6f.18320$vw6.6094@newsread1.news.atl.earthlink.net, Jeff at
jfischman@earthlink.net wrote on 10/23/05 6:52 PM:
| Quote: | I am interested in changing tubes in a 6550 amp to GE 6550's
is there anything that has to be done to the amp first or are they
interchangeable
thanks,
Jeff
|
AFAIK they should be interchangeable. The GEs will handle quite a bit of
current. More so than current Russian types, in my limited experience.
Jon |
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Patrick Turner
Guest
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| Posted:
Mon Oct 24, 2005 4:43 am Post subject:
Re: Can I use 6550A in Amp made for 6550C |
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Jon Yaeger wrote:
| Quote: | in article RuU6f.18320$vw6.6094@newsread1.news.atl.earthlink.net, Jeff at
jfischman@earthlink.net wrote on 10/23/05 6:52 PM:
I am interested in changing tubes in a 6550 amp to GE 6550's
is there anything that has to be done to the amp first or are they
interchangeable
thanks,
Jeff
AFAIK they should be interchangeable. The GEs will handle quite a bit of
current. More so than current Russian types, in my limited experience.
|
All sovtek and EH types are the same internally but the EH range have
prettier glass
to sell at higher prices are just as cabable as any NOS US made 6550
including jan GE6550A, supposed to be the best but
the russian 6550 seem to be just as good; ie, same power into the same load
range at clipping.
Patrick Turner.
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Jim McShane
Guest
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| Posted:
Mon Oct 24, 2005 4:43 am Post subject:
Re: Can I use 6550A in Amp made for 6550C |
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Jeff wrote...
| Quote: | I am interested in changing tubes in a 6550
amp to GE 6550's is there anything that has
to be done to the amp first or are they
interchangeable
|
They are completely interchangeable. Just be
sure you reset the bias, which you would need to
do anytime that power tubes got changed anyway.
If you need GEs let me know, I have good stock
on hand.
Jim McShane
Need Tubes? Got a H-K Citation (Pre) Amp?
Check http://pages.prodigy.net/jimmcshane
Repro knobs for Citation gear in stock! |
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Jon Yaeger
Guest
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| Posted:
Mon Oct 24, 2005 6:10 pm Post subject:
Re: Can I use 6550A in Amp made for 6550C |
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in article 435C5CF4.2CDA8B9D@turneraudio.com.au, Patrick Turner at
info@turneraudio.com.au wrote on 10/24/05 12:07 AM:
| Quote: |
Jon Yaeger wrote:
in article RuU6f.18320$vw6.6094@newsread1.news.atl.earthlink.net, Jeff at
jfischman@earthlink.net wrote on 10/23/05 6:52 PM:
I am interested in changing tubes in a 6550 amp to GE 6550's
is there anything that has to be done to the amp first or are they
interchangeable
thanks,
Jeff
AFAIK they should be interchangeable. The GEs will handle quite a bit of
current. More so than current Russian types, in my limited experience.
All sovtek and EH types are the same internally but the EH range have
prettier glass
to sell at higher prices are just as cabable as any NOS US made 6550
including jan GE6550A, supposed to be the best but
the russian 6550 seem to be just as good; ie, same power into the same load
range at clipping.
Patrick Turner.
|
PATRICK,
Is there any difference between the Russian and the GE when you run them at
the edge of their operational points (high voltage/high current, e.g. In a
Citation II amp) IMHO, the Sovteks etc. plates get redder sooner.
Is my experience singular or has anyone else observed that? |
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Patrick Turner
Guest
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| Posted:
Tue Oct 25, 2005 9:53 pm Post subject:
Re: Can I use 6550A in Amp made for 6550C |
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Jon Yaeger wrote:
| Quote: | in article 435C5CF4.2CDA8B9D@turneraudio.com.au, Patrick Turner at
info@turneraudio.com.au wrote on 10/24/05 12:07 AM:
Jon Yaeger wrote:
in article RuU6f.18320$vw6.6094@newsread1.news.atl.earthlink.net, Jeff at
jfischman@earthlink.net wrote on 10/23/05 6:52 PM:
I am interested in changing tubes in a 6550 amp to GE 6550's
is there anything that has to be done to the amp first or are they
interchangeable
thanks,
Jeff
AFAIK they should be interchangeable. The GEs will handle quite a bit of
current. More so than current Russian types, in my limited experience.
All sovtek and EH types are the same internally but the EH range have
prettier glass
to sell at higher prices are just as cabable as any NOS US made 6550
including jan GE6550A, supposed to be the best but
the russian 6550 seem to be just as good; ie, same power into the same load
range at clipping.
Patrick Turner.
PATRICK,
Is there any difference between the Russian and the GE when you run them at
the edge of their operational points (high voltage/high current, e.g. In a
Citation II amp) IMHO, the Sovteks etc. plates get redder sooner.
Is my experience singular or has anyone else observed that?
|
Whether plates go red is dependant on the dissipation.
Its my experience that russian 6550s don't go red in the face any
sooner than the yanky tubes when embarrassed with volts and amps.
I bought a dozen janGE500A in 1996, and I have
witnessed their slow decline in two amps I sold.
after thousands of hours about 4 developed positive voltages across their grid R
which had to be kept below 50k or else they could run away with fixed bias.
All were still capable of full power, most had had several
red plate experiences.
I just have not witnessed the way the russians are wearing longterm
except for a couple of 6550 sovtek in a pair of leak amps
for class A triode power; they lasted well for their first 5 years, but I get
very very few reports of failures.
A colleague recommends the plain looking and cheap Sovtek 6550 and KT88 because
their
innards are exactly the same as the more prettied up version, the 6550EH and
KT88EH.
The russian equivalent of all 6550 and KT88 are all the same internally,
but slightly different to the original 6550 and KT88 made in the 50s and 60s.
In guitar amps, anything can fail anytime since running with excessive screen
currents
sometimes occurs with a wrong speaker load etc.
Russian tubes are only the same cost as a couple of large hamburgers, and in real
terms
tubes have never been as cheap as they are now.
So if somebody stuffs the occasional tube it should not be a big worry.
Then there are Valve Art chinese tubes; not all chinese tubes are crap.
Patrick Turner. |
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