Hello :
A GE black plate 6AQ5 and / or, in this case, a GE 6005, is pictured below.
Notice the three circular strengthening ridges in its 12 Watt rated plate? Notice a ROUND plate !!
....
Now, go back to Post #59, and re-look inside the EIMAC 304TL. Look at ANY of the four internal 75 Watt larger plate assemblies. They have "wings" for cooling, very good, but...... also, look !!! The EIMAC 304TLs have four quite similar strengthening ridges, in their 75 Watt round plates.
I contend such symmetrical designs, round plates, matching round grids, and cathodes if applicable, are superior in their electron flow. Intrinsically superior, to all the world's existing vacuum tubes with NON round, NON symmetrical to-each-other internal element assemblies. It is audible folks !!!
It is physics, no textbook reading needed, simply physics applied by thinking some. KISS rules !!! If we are going to build something and seek the very highest performance, we should apply the best physical shapes to the elements in our designs.
Note, the internal spacing in a 6AQ5/6005, between elements, is very close.
I was taught by Dennis Fraker to ALWAYS seek long term reliability, so I do NOT operate these 6AQ5/6005 tubes near their maximum 250 or 275 VDC rating. Usually aim for 225 VDC as a maximum plate to cathode VDC difference. No internal tube shorts, are ever wanted.
I also seek a Golden Ratio of " actual to Maximum " rated plate dissipation, to have literally decades of tube life, at the expense of fractionally less Power Output. A conservative / quite wise choice, IME. 62 percent of 12 Watts is 7.44 Watts of plate power / dissipation, while at no-signal, while at idle. Its like driving your car on a High Speed Road, all day / continuously at 62 MPH rather than continuously at 120 MPH. ( MPH works better than with kilometers per hour. )
I have been experimenting with this tube, for only maybe seven or eight years. The tube, when optimally employed, is awesome - performing. F.M. LLiu has nicely attested to this recently, with my 2022 S/N #2. But it was not until the 2021 6005 build, fully documented on HFV, that I have gotten to where I feel fully " comfortable " ( in late-2022, early-2023 ) with the 6005's audio performance.
Crudely externally-paralleling the 2021 STEREO / SINGLE 6005 amp build, into a " DOUBLE 6005 monoblock " ( in December 2022 ), was an eye-or-ear-opener. My Audio Mentor Dennis tells me, for ALTEC 16 inch woofers, loaded into an A7 VOTT enclosure, this upcoming TRIPLE SE amp is where I will be happiest, overjoyed, and can stop. Coming up, such an amp - sometimes in the first half of 2023 !! I'm getting excited to have and hear this, at will - at the flick of a switch. " The Dennis TRIPLE- FSHS ".
Jeff
A GE black plate 6AQ5 and / or, in this case, a GE 6005, is pictured below.
Notice the three circular strengthening ridges in its 12 Watt rated plate? Notice a ROUND plate !!
....
Now, go back to Post #59, and re-look inside the EIMAC 304TL. Look at ANY of the four internal 75 Watt larger plate assemblies. They have "wings" for cooling, very good, but...... also, look !!! The EIMAC 304TLs have four quite similar strengthening ridges, in their 75 Watt round plates.
I contend such symmetrical designs, round plates, matching round grids, and cathodes if applicable, are superior in their electron flow. Intrinsically superior, to all the world's existing vacuum tubes with NON round, NON symmetrical to-each-other internal element assemblies. It is audible folks !!!
It is physics, no textbook reading needed, simply physics applied by thinking some. KISS rules !!! If we are going to build something and seek the very highest performance, we should apply the best physical shapes to the elements in our designs.Note, the internal spacing in a 6AQ5/6005, between elements, is very close.
I was taught by Dennis Fraker to ALWAYS seek long term reliability, so I do NOT operate these 6AQ5/6005 tubes near their maximum 250 or 275 VDC rating. Usually aim for 225 VDC as a maximum plate to cathode VDC difference. No internal tube shorts, are ever wanted.
I also seek a Golden Ratio of " actual to Maximum " rated plate dissipation, to have literally decades of tube life, at the expense of fractionally less Power Output. A conservative / quite wise choice, IME. 62 percent of 12 Watts is 7.44 Watts of plate power / dissipation, while at no-signal, while at idle.
Its like driving your car on a High Speed Road, all day / continuously at 62 MPH rather than continuously at 120 MPH. ( MPH works better than with kilometers per hour. )I have been experimenting with this tube, for only maybe seven or eight years. The tube, when optimally employed, is awesome - performing. F.M. LLiu has nicely attested to this recently, with my 2022 S/N #2. But it was not until the 2021 6005 build, fully documented on HFV, that I have gotten to where I feel fully " comfortable " ( in late-2022, early-2023 ) with the 6005's audio performance.
Crudely externally-paralleling the 2021 STEREO / SINGLE 6005 amp build, into a " DOUBLE 6005 monoblock " ( in December 2022 ), was an eye-or-ear-opener. My Audio Mentor Dennis tells me, for ALTEC 16 inch woofers, loaded into an A7 VOTT enclosure, this upcoming TRIPLE SE amp is where I will be happiest, overjoyed, and can stop. Coming up, such an amp - sometimes in the first half of 2023 !! I'm getting excited to have and hear this, at will - at the flick of a switch. " The Dennis TRIPLE- FSHS ".
Jeff
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