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Post by bigben55 on Sept 16, 2014 16:00:09 GMT -7
As in, amp is too loud, so instead of running two 6V6s, pull one out and just run one? I did this with a 1970 Fender Twin from time to time, but that's a different animal than the Z28, which I haven't done it to. But why would it be any different? I've just never heard of anyone doing so, at least since I've frequented this board. Anyone?
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Post by headshrinker (Marc) on Sept 16, 2014 16:07:55 GMT -7
You can never pull one tube in a two tube amp. You can pull either the two inner or two outer tubes in many but not all ( can't do it in the remedy or Jaz 20/40 for Z amps) four tube amps like a twin. You can't pull one in a four tube amp. Whether you can or not and which ones depends on how the power tubes are configured.
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Post by Jaguarguy (Mike) on Sept 16, 2014 16:17:31 GMT -7
Marc is correct - don't do it!
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Post by bigben55 on Sept 16, 2014 17:00:42 GMT -7
You can never pull one tube in a two tube amp. You can pull either the two inner or two outer tubes in many but not all ( can't do it in the remedy or Jaz 20/40 for Z amps) four tube amps like a twin. You can't pull one in a four tube amp. Whether you can or not and which ones depends on how the power tubes are configured. Ok. That's why I've never heard of it then, and I most definitely wont. But can anyone explain to me why? Just curious.
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Post by Jaguarguy (Mike) on Sept 16, 2014 17:52:40 GMT -7
Here is a thread from Myles that answers the question. Ask Myles or Chad - amp or live playing questions Dec 21, 2010 at 10:55pm Quote Edit Post by myles on Dec 21, 2010 at 10:55pm Dec 21, 2010 at 9:23pm yarmo said: As stated before, Thanks Myles for the precious tech info you provide to everyone on this forum. It's GREATLY appreciated!! Now to my question: I've read numerous times that pulling out tubes is fine. I've never tried it but I was wondering if I could take one tube out of a Route 66? That would reduce wattage by half I presume. Biasing? Safety? Perceived effect? Thanks in advance! yarmo You may not operate your amp with only one tube. The Route 66 is a push/pull design. The output transformer also expects both tubes to be there. In some amps with four output tubes and an impedance selector you may remove half the tubes, two of the four and change the impedance selector but this can not be done on an amp with two output tubes. This should also NOT be done with cathode biased amps even with four output tubes. I do not recommend doing this at all in any case as the desire effect of cutting the power in half only results in a 3dB decrease in output at best and only at the highest levels. The tone of the amp suffers though because your 100 watt power supply (in the case of a 100 watt Marshall type amp) is now not close to being worked to produce transformer saturation nor is your output transformer. These are both important components of the tone, feel and dynamics of your amp. If you want to reduce your level use an attenuator such as an airbrake or buy a lower wattage amp. You really have no other options that will not compromise tone, safety or reliability. Read more: ztalk.proboards.com/search/results?display_as=0&page=3&what_at_least_one=Pulling%2Bone%2Btube&who_only_made_by=0#ixzz3DWv6Ae77
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Post by thunderstruck(formerly doc001) on Sept 16, 2014 18:21:19 GMT -7
Just say no
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Post by bigben55 on Sept 16, 2014 18:49:09 GMT -7
Thanks!
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Post by doctorice on Sept 21, 2014 18:17:40 GMT -7
You can never pull one tube in a two tube amp. You can pull either the two inner or two outer tubes in many but not all ( can't do it in the remedy or Jaz 20/40 for Z amps) four tube amps like a twin. You can't pull one in a four tube amp. Whether you can or not and which ones depends on how the power tubes are configured. Same is true with at least some Mesa Boogies. I asked about doing this with a Maverick, which is 4 x EL84. "NO" was the factory response.
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