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Post by johneppstein on Sept 17, 2020 13:05:41 GMT -6
Doug, would it be a big deal to include a light showing signal present at the input of the device? That's my only beef with pre's that don't have metering. A detector/indicator circuit like that still requires a separate power supply section for SS circuit voltages, plus the detection and LED driver circuit itself. In this sort of case I'm not sure that you don't have to have a parallel preamp circuit to raise mic level high enough to drive a detector circuit successfully. I don't know how cheaply it could be done, it certainly raises production costs, changes internal design, etc. No, I don't believe it does, at least in most cases. LEDs are generally very low voltage devices and you could just rectify a tap off the heater line in a tube unit.
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Post by Guitar on Sept 17, 2020 13:43:09 GMT -6
A detector/indicator circuit like that still requires a separate power supply section for SS circuit voltages, plus the detection and LED driver circuit itself. In this sort of case I'm not sure that you don't have to have a parallel preamp circuit to raise mic level high enough to drive a detector circuit successfully. I don't know how cheaply it could be done, it certainly raises production costs, changes internal design, etc. No, I don't believe it does, at least in most cases. LEDs are generally very low voltage devices and you could just rectify a tap off the heater line in a tube unit. Thanks I might try that in my Selmer tube amp. I am trying to convert the lamp power indicator to an LED, that's a great idea.
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Post by Quint on Sept 17, 2020 19:32:10 GMT -6
I wish somebody would make a stereo V72 or V76 clone in a 2u chassis. 1u would be even better, but I realize that it's tough to fit all of those tubes in that small of a space, especially when considering heat.
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Post by tkaitkai on Sept 17, 2020 20:15:40 GMT -6
I wish somebody would make a stereo V72 or V76 clone in a 2u chassis. 1u would be even better, but I realize that it's tough to fit all of those tubes in that small of a space, especially when considering heat. Mercury does a stereo V72 in 2u — the M72s MKIII and M72s CSV. I almost bought the mono version years ago before I bought my Wunder. I still want one, though. And one of the Weight Tanks, too.
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Post by johneppstein on Sept 17, 2020 23:08:22 GMT -6
No, I don't believe it does, at least in most cases. LEDs are generally very low voltage devices and you could just rectify a tap off the heater line in a tube unit. Thanks I might try that in my Selmer tube amp. I am trying to convert the lamp power indicator to an LED, that's a great idea. Most pilot lights in guitar amps already run off the 6.3 VAC heater line. For an LED you'll probably want a resistor in series with the LED.
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Post by johneppstein on Sept 17, 2020 23:10:24 GMT -6
I wish somebody would make a stereo V72 or V76 clone in a 2u chassis. 1u would be even better, but I realize that it's tough to fit all of those tubes in that small of a space, especially when considering heat. You might try hanging the tubes out the back, like they did with rack gear in the old days. Good ventilation!
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Post by Ward on Sept 18, 2020 5:20:05 GMT -6
I wish somebody would make a stereo V72 or V76 clone in a 2u chassis. 1u would be even better, but I realize that it's tough to fit all of those tubes in that small of a space, especially when considering heat. Like the Mercury?[/font][/url] Well, it's considerable more than DOUBLE the cost of the Weight Tank. $4500 list with street price at $3800 (1900 a channel) versus less than 1/2 that per channel for Eric's 72. Does it have the same 'girth' as Mercury's fat-bottomed girl? Well, nobody has said otherwise yet . . . and I'll let you know my thoughts. Although I have used a Mercury, I do not own one. Buutttt... I have a pretty good memory for sound. So I can give you a tiny bit of weight in on how they compare, and thus we could always lobby Eric for a stereo/dual version of it if it seems like a sellable product.
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