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#1 |
diyAudio Member
Join Date: Oct 2017
Location: Chicago, IL
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Has anyone successfully bipassed the volume pot entirely in the Elekit TU8600 amp? Would there be sonic gain from running the amp without the attenuator and using a preamp? I have the need for digital and analog single ended inputs and the Elekit has only one set of inputs. I would ideally like to use the unit as an amplifier only. Currently I either switch inputs manually or use a preamp and keep the Elekit volume at 12 o'clock, adjusting volume from the preamp.
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#2 |
diyAudio Member
Join Date: May 2015
Location: Melbourne
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What is "sonic gain"?
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#3 | |
diyAudio Member
Join Date: Jan 2018
Location: Budapest
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Quote:
Here is a similar thread: TU8500 + TU8600 - volume position If I were in the same situation then I would use a passive preamp and a separate RIAA phono unit. I am not a native English speaker but to me it means something like "sonic benefit" or simply "better sound". |
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#4 |
diyAudio Member
Join Date: Oct 2017
Location: Chicago, IL
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Interesting. So do you think I should turn it to it’s maximum setting?
Yes, sonic gain was meant to be better sound. |
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#5 |
diyAudio Member
Join Date: Jan 2018
Location: Budapest
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Yes, at least for the following reasons
a) this is the position that affects the signal quality the least by far b) the volume attenuator's position has impact on the bandwidth c) you will get the same volume levels if you bypass the potmeter, which is what you want to do The only exception to this rule would be a noisy input stage in the amp before the volume potmeter, but the TU-8600 does not have anything like that |
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#6 | |
diyAudio Member
Join Date: Jan 2013
Location: West Australia, near to the beach, natural ambient sounds mostly.
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Quote:
My choice would be to add sockets and a DPDT switch to the rear panel of the TU 8600 and modify the pcb connections....cut two tracks (L&R) and add 6 wires (take care of wire directions). Running preamp upstream adds extra cables and preamp noise/distortion/colouration which may be subjectively pleasing, but ime direct connection to power amp is best. If you decide to run the preamp you could replace the amp volume pot with fixed resistors to set fixed gain and you can experiment with resistor types (MF, CF etc) and this will set a 'tone' to the amp that is likely preferable to cheap generic carbon volume pot and would also help in 'perfect' channel matching. Dan.
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"Never ignore the noise, it carries information" - does white noise exist ?. Last edited by Max Headroom; 27th June 2019 at 04:03 PM. |
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#7 |
frugal-phile(tm)
diyAudio Moderator
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I am usually adding a volume (gain) control to my poweramps so that they can easily be used with PLLXO when i biamp. If you are using the TU-8600 as a power amp, turn the volume up all the way and it will effectively be out of the circuit (but for the shunt series R — often used as the gtid resistor for the following tube.
dave
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#8 |
diyAudio Member
Join Date: Jan 2013
Location: West Australia, near to the beach, natural ambient sounds mostly.
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Turning the TU 8600 volume to max will degrade system signal/noise, this is why I suggested replacement with fixed resistors or extra sockets/switch.
Dan.
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"Never ignore the noise, it carries information" - does white noise exist ?. |
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#9 | |
diyAudio Member
Join Date: Jan 2018
Location: Budapest
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Quote:
From a signal perspective, setting the volume to max in such cases connects the input to the first stage of the amp directly and also to the ground via an 50k Ohm resistor. This is how power amps are usually wired, the only difference is their somewhat lower sensitivity compared to the Elekit models. Adding second input and a toggle switch is fine as long as you are willing to make irreversible changes to the casework and mess up the PCB and have the right tools, and you also accept the inconvenience of a having to use the input switch on the back. I personally prefer a passive preamp. Ferenc Last edited by paczeltf; 28th June 2019 at 11:48 AM. |
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#10 |
diyAudio Member
Join Date: Jan 2013
Location: West Australia, near to the beach, natural ambient sounds mostly.
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I am assuming that the amplifier is setup to provide rated output with standard level input and volume control set at 12:00 with which is -20dB attenuation as per normal practice.
Amp vol control set to 100% therefore causes preamp needs to run at -20dB operating level and this causes loss of system SNR of 20dB at max system output, and worse at lower level system output. Volume pot can be replaced with fixed resistors in 9:1 ratio to give same sensitivity as 50% volume control and discrete resistors may sound better than carbon vol control. Dan.
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"Never ignore the noise, it carries information" - does white noise exist ?. |
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