Tube Coolers, GT - 12AU7 Groove Tube Match, Balance Pair Fender E82CC ECC82
Item History & Price
| Reference Number: Avaluer:7500530 | Brand: Fender |
Platinum Tubes Tube Coolers + GT-12AU7 Groove Tube Match + Balance Pair 5654 X 4
GT-12AU7 Pair (2 Tubes) Matched and Balanced within 5%
New Current Production
Tubes are first balanced triode section to triode section, and then matched to each other.
"The Groove Tubes GT-12AU7 preamp tube is based on a design from the Ei factory in the former Yugoslavia. The GT-12AU7 is an excellent quality large-plate European-made driver tube, styled after the famous Telefunken line of dua...l triodes. The usual application for a 12AU7 tube is as the phase inverter that drives the power tubes. These are very well matched, and so are highly recommended for Ampeg SVT's and other amps using this tube as a phase inverter. Also commonly used as phase inverters in McIntosh Hi-Fi amps, some Ampeg amps, and will yield the most clean headroom in many amps.
In the latest Fender Pro Series amps such as the Pro Reverb, Concert, and Twin, this tube in V2 (or a 12AY7), will drop the gain of the gain channel where some feel the tone is of a less intense or "buzzy" character. This will then allow a much wider range in the sweep of the volume and gain controls of this channel."
Amplitrex AT1000 Matched and Tested
MCF-9 Tube Cooler Pair (2 Coolers)
Pearl Tube Coolers have been in continuous production for 20 years, during which time over 300, 000 pieces have found their way into audio systems the world over. Perhaps the longest running and most successful tube audio accessory of all time Pearl Tube Coolers have inspired a host of much more costly imitators, none of which combine the functions of cooling and microphonic reduction achieved by the long-established Pearl design.Based on research begun in the early 1950s by the US military and the aeronautical industry, Pearl coolers achieve the sorts of glass temperature reductions shown over 50 years ago to greatly increase the operating life of soft-glass enclosed electron tubes.
Determined during the '50s research is the fact that the "soft glass" almost always used in receiving tube manufacture is susceptible to high temperature operation in that it becomes effectively "porous" at elevated temperatures, thereby allowing atmospheric contamination of the high vacuum within the glass. By several extensively researched and solidly confirmed mechanisms such contamination has been shown to have destructive effects on the electron emitting surfaces upon which tube functioning is completely dependent and extended tube life relies.
Although it has been common knowledge in other sectors of the electronics industry for decades, this information seems to have escaped the attention of most designers of tube-type home entertainment system.
The glass envelope, which must act as a high quality vacuum container, is required to preform several functions:
- at high temperatures, it must resist the pressure differential between the internal high-vacuum and external atmospheric pressure.
- it must be chemically intert, neither adsorbing gases during manufacture nor liberating them under high-temperature operation.
- it must withstand high operating temperatures, substantial attendant temperature gradients and consequential physical stress; without failure.
No Returns; defective tubes will be replaced free of charge for 60 days.
WHY PLATINUM TUBES?
Once purchased and received by Platinum Tubes, vacuum tubes undergo exacting quality control measures to further assure reliable, sonically acceptable performance. Power output tubes are first mounted in test fixtures and burned in for 24 hours. This burn-in helps stabilize the internal operating parameters of the tubes before measurements begin. Each power tube is then tested and graded for technical characteristics specified by platinum tubes engineers. Only after a tube successfully passes these exacting challenges is it labeled and put into stock to be sold. Tubes not meeting these criteria are rejected to the supplier or disposed of.
Average tube life will depend on several parameters: product type, how the product is installed, loudspeaker efficiency, room size and acoustic damping, listening habits or average sound pressure levels, A.C. line stability and purity, and other circumstances. Generally, preamplifier tubes last up to 5, 000 hours, while power amplifier output tubes will last up to 3, 000 hours. Near the end of their useful sonic life, aging vacuum tubes may degrade the sonic character of the product(s) they are used in. The sound may become somewhat dry and lifeless, with a noticeable decrease in harmonic richness or bloom. Bass response may be diminished, and musical dynamics may flatten out or compress. Toward the very end of their service life, tubes may become noisy, noticeable as a slight rushing sound or rustling noise. It is far better to replace vacuum tubes prior to the end of their service life, before severe sonic degradation or outright failure occurs. Running vacuum tubes into failure may damage to other internal components and cause needless repair expense.
Factors which can shorten tube life include inadequate ventilation, overdriving loudspeakers at continuously high volume levels, severely fluctuating A.C. line conditions (e.g. sagging line voltage during summer peaks of air-conditioning demand), or severe interference pulses or electromagnetic interference.
SHIPPING INFORMATIONUSA Shipping FREE (USPS) (free shipping applies only for lower 48 states)International $15.00 (USPS)
GT-12AU7 Pair (2 Tubes) Matched and Balanced within 5%
New Current Production
Tubes are first balanced triode section to triode section, and then matched to each other.
"The Groove Tubes GT-12AU7 preamp tube is based on a design from the Ei factory in the former Yugoslavia. The GT-12AU7 is an excellent quality large-plate European-made driver tube, styled after the famous Telefunken line of dua...l triodes. The usual application for a 12AU7 tube is as the phase inverter that drives the power tubes. These are very well matched, and so are highly recommended for Ampeg SVT's and other amps using this tube as a phase inverter. Also commonly used as phase inverters in McIntosh Hi-Fi amps, some Ampeg amps, and will yield the most clean headroom in many amps.
In the latest Fender Pro Series amps such as the Pro Reverb, Concert, and Twin, this tube in V2 (or a 12AY7), will drop the gain of the gain channel where some feel the tone is of a less intense or "buzzy" character. This will then allow a much wider range in the sweep of the volume and gain controls of this channel."
Amplitrex AT1000 Matched and Tested
MCF-9 Tube Cooler Pair (2 Coolers)
Pearl Tube Coolers have been in continuous production for 20 years, during which time over 300, 000 pieces have found their way into audio systems the world over. Perhaps the longest running and most successful tube audio accessory of all time Pearl Tube Coolers have inspired a host of much more costly imitators, none of which combine the functions of cooling and microphonic reduction achieved by the long-established Pearl design.Based on research begun in the early 1950s by the US military and the aeronautical industry, Pearl coolers achieve the sorts of glass temperature reductions shown over 50 years ago to greatly increase the operating life of soft-glass enclosed electron tubes.
Determined during the '50s research is the fact that the "soft glass" almost always used in receiving tube manufacture is susceptible to high temperature operation in that it becomes effectively "porous" at elevated temperatures, thereby allowing atmospheric contamination of the high vacuum within the glass. By several extensively researched and solidly confirmed mechanisms such contamination has been shown to have destructive effects on the electron emitting surfaces upon which tube functioning is completely dependent and extended tube life relies.
Although it has been common knowledge in other sectors of the electronics industry for decades, this information seems to have escaped the attention of most designers of tube-type home entertainment system.
The glass envelope, which must act as a high quality vacuum container, is required to preform several functions:
- at high temperatures, it must resist the pressure differential between the internal high-vacuum and external atmospheric pressure.
- it must be chemically intert, neither adsorbing gases during manufacture nor liberating them under high-temperature operation.
- it must withstand high operating temperatures, substantial attendant temperature gradients and consequential physical stress; without failure.
No Returns; defective tubes will be replaced free of charge for 60 days.
WHY PLATINUM TUBES?
Once purchased and received by Platinum Tubes, vacuum tubes undergo exacting quality control measures to further assure reliable, sonically acceptable performance. Power output tubes are first mounted in test fixtures and burned in for 24 hours. This burn-in helps stabilize the internal operating parameters of the tubes before measurements begin. Each power tube is then tested and graded for technical characteristics specified by platinum tubes engineers. Only after a tube successfully passes these exacting challenges is it labeled and put into stock to be sold. Tubes not meeting these criteria are rejected to the supplier or disposed of.
Average tube life will depend on several parameters: product type, how the product is installed, loudspeaker efficiency, room size and acoustic damping, listening habits or average sound pressure levels, A.C. line stability and purity, and other circumstances. Generally, preamplifier tubes last up to 5, 000 hours, while power amplifier output tubes will last up to 3, 000 hours. Near the end of their useful sonic life, aging vacuum tubes may degrade the sonic character of the product(s) they are used in. The sound may become somewhat dry and lifeless, with a noticeable decrease in harmonic richness or bloom. Bass response may be diminished, and musical dynamics may flatten out or compress. Toward the very end of their service life, tubes may become noisy, noticeable as a slight rushing sound or rustling noise. It is far better to replace vacuum tubes prior to the end of their service life, before severe sonic degradation or outright failure occurs. Running vacuum tubes into failure may damage to other internal components and cause needless repair expense.
Factors which can shorten tube life include inadequate ventilation, overdriving loudspeakers at continuously high volume levels, severely fluctuating A.C. line conditions (e.g. sagging line voltage during summer peaks of air-conditioning demand), or severe interference pulses or electromagnetic interference.
SHIPPING INFORMATIONUSA Shipping FREE (USPS) (free shipping applies only for lower 48 states)International $15.00 (USPS)
