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scottp
Guest
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 Posted:
Sun Oct 30, 2005 2:56 am Post subject:
load mismatch fender amp question |
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I have managed to get to oxford 12L6 to try out in my pro reverb.
However they are 16ohm not 8ohm as the amp requires. Can I run
the 16ohms speakers instead of the 8ohm speakers in my amp without
damaging the amp. I've heard about ugly things like fly back would
toast your gear if you do something like this. Could someone carify
when fly back becomes an issue?
Thanks,
Scott
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Bret Ludwig
Guest
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| Posted:
Sun Oct 30, 2005 3:15 am Post subject:
Re: load mismatch fender amp question |
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Have you been listening to demented meat cutters again?
Running a guitar amp with a high load, unless it is something like
five times the correct load, simply means you will develop less power
and a different amount of distortion. Unfortunately, guitar amp service
is essentially destructive-you are operating the amplifier outside
normal design parameters as a "tone <sic> generator" and like the movie
Dino never finished-"something's got to give".
Perhaps you should fit an aftermarket opt now so that if you do blow
it up you can replace it with the original one preserving its collector
value. But I don't think your transformer or tubes will have any
shorter life from this change alone. |
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Pooh Bear
Guest
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| Posted:
Sun Oct 30, 2005 9:11 pm Post subject:
Re: load mismatch fender amp question |
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scottp wrote:
| Quote: | I have managed to get to oxford 12L6 to try out in my pro reverb.
However they are 16ohm not 8ohm as the amp requires. Can I run
the 16ohms speakers instead of the 8ohm speakers in my amp without
damaging the amp.
|
Yes, you can. Nottrouble. It'll reduce dissipation in the output tubes
as well.
You'll get double the damping factor too which may interest you.
| Quote: | I've heard about ugly things like fly back would
toast your gear if you do something like this. Could someone carify
when fly back becomes an issue?
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When there's no load.
Graham |
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Lord Valve
Guest
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| Posted:
Sun Oct 30, 2005 11:51 pm Post subject:
Re: load mismatch fender amp question |
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Pooh Bear wrote:
| Quote: | scottp wrote:
I have managed to get to oxford 12L6 to try out in my pro reverb.
However they are 16ohm not 8ohm as the amp requires. Can I run
the 16ohms speakers instead of the 8ohm speakers in my amp without
damaging the amp.
Yes, you can. Nottrouble. It'll reduce dissipation in the output tubes
as well.
You'll get double the damping factor too which may interest you.
I've heard about ugly things like fly back would
toast your gear if you do something like this. Could someone carify
when fly back becomes an issue?
When there's no load.
Graham
|
Twice normal impedance is flyback bait.
Believe me, I've been replacing fried tube sockets (and worse)
for four decades, most of 'em on Marshalls which were set at
4 or 8 and run into a 16-ohm cabinet. Remember, guitar amps
are routinely run at full saturation, and that makes plenty of
spikes. Many amps come with diode clamps to try to avoid
this. If you need to run a mismatch, *downward* is better.
LV |
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Bret Ludwig
Guest
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| Posted:
Mon Oct 31, 2005 3:29 am Post subject:
Re: load mismatch fender amp question |
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Lord Valve wrote:
<<snip>>
| Quote: |
Twice normal impedance is flyback bait.
Believe me, I've been replacing fried tube sockets (and worse)
for four decades, most of 'em on Marshalls which were set at
4 or 8 and run into a 16-ohm cabinet. Remember, guitar amps
are routinely run at full saturation, and that makes plenty of
spikes. Many amps come with diode clamps to try to avoid
this. If you need to run a mismatch, *downward* is better.
|
If that were true the old Williamsons would have mostly
self-destructed by now, The diode clamps are probably a good idea, but
using ceramic sockets and Glyptal coating the solder joints would be
more helpful. As well as using output transformers such as the THD
which are designed for big hypot margins, which is easy with modern
insulating materials.
Hypotters are a big key to tube equipment reliability, and people
refuse to make the investment. |
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Sander deWaal
Guest
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| Posted:
Mon Oct 31, 2005 4:07 am Post subject:
Re: load mismatch fender amp question |
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"Bret Ludwig" <bretldwig@yahoo.com> said:
| Quote: |
Lord Valve wrote:
snip
Twice normal impedance is flyback bait.
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| Quote: | If that were true the old Williamsons would have mostly
self-destructed by now,
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Nope.
The high GNFB prevents that.
Guitar amps usually have low amounts of loop feedback.
--
"Audio as a serious hobby is going down the tubes."
- Howard Ferstler, 25/4/2005 |
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Phil Allison
Guest
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| Posted:
Mon Oct 31, 2005 5:43 am Post subject:
Re: load mismatch fender amp question |
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"Pooh Bear"
| Quote: |
I've heard about ugly things like fly back would
toast your gear if you do something like this. Could someone carify
when fly back becomes an issue?
When there's no load.
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** Complete moron.
When you have no idea about a topic - fucking well shut up .
Graham Stevenson = fake, liar and a complete turd.
.......... Phil |
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Phil Allison
Guest
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| Posted:
Mon Oct 31, 2005 5:43 am Post subject:
Re: load mismatch fender amp question |
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"Bret Ludwig"
| Quote: |
Lord Valve wrote:
snip
Twice normal impedance is flyback bait.
Believe me, I've been replacing fried tube sockets (and worse)
for four decades, most of 'em on Marshalls which were set at
4 or 8 and run into a 16-ohm cabinet. Remember, guitar amps
are routinely run at full saturation, and that makes plenty of
spikes. Many amps come with diode clamps to try to avoid
this. If you need to run a mismatch, *downward* is better.
..
If that were true the old Williamsons would have mostly
self-destructed by now,
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** Huh ?
What breed of autistic drivel is this shite ??
| Quote: | The diode clamps are probably a good idea, but
using ceramic sockets and Glyptal coating the solder joints would be
more helpful.
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** Huh ?
What breed of autistic drivel is this shite ??
| Quote: | As well as using output transformers such as the THD
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** Huh ?
What breed of autistic drivel is this shite ??
The subject is bloody guitar amps !!!!!!!!!!
............ Phil |
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Pooh Bear
Guest
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| Posted:
Fri Nov 04, 2005 3:51 pm Post subject:
Re: load mismatch fender amp question |
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Phil Allison wrote:
| Quote: | "Pooh Bear"
I've heard about ugly things like fly back would
toast your gear if you do something like this. Could someone carify
when fly back becomes an issue?
When there's no load.
** Complete moron.
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I think you'll find that an absence of load will kill most valve amps very
effectively.
Graham |
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Phil Allison
Guest
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| Posted:
Fri Nov 04, 2005 4:39 pm Post subject:
Re: load mismatch fender amp question |
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"Pooh Bear"
| Quote: |
I've heard about ugly things like fly back would
toast your gear if you do something like this. Could someone carify
when fly back becomes an issue?
When there's no load.
** Complete moron.
I think you'll find that an absence of load will kill most valve amps very
effectively.
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** When you have no FUCKING idea about a topic - fucking well shut up .
Graham Stevenson = fake, liar and complete turd.
........... Phil |
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