Yes we do. The power tubes go through 24 hour burn in, then matched for Ip and gm. We match all power tubes ourselves We match using several methods, including our own custom equipment, often resulting in far better matching than those matched by the factory or distributors. We are also one of the very few who burn-in and match tubes like SV811-3 in quantity. Please refer to Power Tube Matching.

In general, you probably want matched output tubes. (Hi fi folks like matched preamp tubes, but most guitar amp folks don't care about that.) Matched tubes mean they will all draw the same current under the same conditions, at the very least. This yields the most uniform waveforms, makes biasing easier, and is generally easiest on your output transformer and tubes. On the other hand, unmatched tubes can produce distortion sounds that some people like.

No, unless the circuit is modified by a professional technician. We do not advise this because the amps are designed around specific power tubes, and modification may void the warranty.

Yes they are. Many of our customers request matching pairs of small signal tubes like 12AX7. We set aside matching triode tubes, then we pair up the ones that are the same. This way, all the triodes in the tubes are close to one another. We charge $2 per tube for triode matched or matched pair small signal tubes.

I can replace or refund any tubes you are not happy with if you request it within 30 days from the date of sale. I do not test tubes in an actual amplifier, so it is possible there may be some variation from the matching results I obtained on my tester. Vintage tubes are getting scarce, and it may be difficult to get a match closer than 5 percent with the tubes I have in stock.

This depends on several factors, including LED type/color, LED spacing, etc. In a nutshell, LEDs are significantly more efficient at producing light than neon tubes. If enough LEDs are placed together to match the light output of a neon tube, the power required to match it with LEDs will often be quite a bit less.

Current models have an internal adjustable bias, see Owner's Manual page for details. Hellhound amps do not have an adjustable bias. It's not necessary with the Hellhound as long as you use a matched set of 6L6 power tubes that are rated in the middle range (for example: 5, 6, 7 on a scale of 1 to 10). Just install and play.

No, because 6L6 tubes draw a higher filament current which might cause damage to the power transformer.

Bias them anywhere between the hot side limit meaning "any hotter and they get damaged" and the cold side limit meaning "wow, that sounds BAD". Anywhere in that range is OK. There is no "correct" bias setting, keep it safe and then put it anywhere you like the sound. Biased colder, they might last longer. -Jeff S In other words, bias them so you like the sound and make sure that bias setting is within the specs, and you have the right bias setting for your amp. -Miles)

Most of the time, otitis media clears up with proper medication and home treatment. In many cases, however, further treatment may be recommended by your physician. An operation, called a myringotomy may be recommended. This involves a small surgical incision (opening) into the eardrum to promote drainage of fluid and to relieve pain. The incision heals within a few days with practically no scarring or injury to the eardrum.

No. We run a bizniz not a training institute. I wish we had more time to be able to educate people about the wonderful world of vacuum tubes, but we just don't. FAQ #1d. Ms. EveAnna, what a way cool website!!!!!!!!!!!!.....awe geez, no manley gear here, but the piggy bank is started...been surfin through commonsenseaudio shoppin' for 'tiques....and stumbled, almost fell, into manley labs....ok, so umm, i've been a solid stater, no hitting......pretty much toured your world...

No, you don't have to toss them just yet. However, a blue glow indicates the presence of some gas in the tube, which is not a problem in most situations. If you have noticed an increase in the amount of blue, then you might want to get a new set of tubes sooner than later. Too much gas in the tube can lead to bias failures, blown fuses, and possibly blown output transformers.

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All of these tubes are made right here in the U.S.A. The tubes are manufactured and shipped very close to Salt Lake City, Utah.

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A matched system is important for a variety of reasons. One is comfort. When all your components are properly sized to your home, you can control exactly how much heating or cooling you need so you can relax. Also, a properly sized matched system enables every component to perform as designed, meaning proper cycle times are maintained, humidity is controlled, and system sound is minimized. Another reason matched systems are important is efficiency.

Fill Power is a measurement of the quality of down products. Fill power is determined by placing 1 ounce of down in a glass tube. It is compressed, the weight is removed, and then the down is allowed to loft for 72 hours. The space the down occupies is measured in cubic inches. Down comforters with a higher fill power are lighter, fluffier, and warmer than down comforters with less fill power. Once the down has been separated, cleaned and sterilized, it's sorted by fill power.

The short answer is, peace of mind. Tubes offer clarity, richness and purity of tone that simply cannot be attained with solid-state silicon or germanium technologies such as transistors, FETs or opamps. True bypass is no longer an issue because our pedals do not contain any opamp or transistor buffers that will destroy your tone.

Yes! We currently offer power-leveling for World of Warcraft US and EU servers, please check the Account sections for WoW(US) and WoW(EU) for more information.