Hi friends
I'm not sure wether installing 2 sets of connectors for an input as well as on output is creating a problem? Does this create any problem of sorts?
Same with speaker-posts, must I decide to use either speakon OR bananas?
To make sure a double connection cannot be made, I could switch them, but then there'd be a switch in the signal...
(I'd like to install Lemo/nim-camac plugs because they're good, but on the other hand what do I do with other gear then?)
Thank you!
stay safe
david
I'm not sure wether installing 2 sets of connectors for an input as well as on output is creating a problem? Does this create any problem of sorts?
Same with speaker-posts, must I decide to use either speakon OR bananas?
To make sure a double connection cannot be made, I could switch them, but then there'd be a switch in the signal...
(I'd like to install Lemo/nim-camac plugs because they're good, but on the other hand what do I do with other gear then?)
Thank you!
stay safe
david
No problem, lots of other gear does this. Just don't use both types of inputs at the same time.
If there are two output loads at the same time, make sure the circuit can drive both.
Not the best practice for phono inputs. though.
If there are two output loads at the same time, make sure the circuit can drive both.
Not the best practice for phono inputs. though.
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one output stage can connect to two input stages
but
two output stages cannot connect to one input stage.
but
two output stages cannot connect to one input stage.
The amplifier has no idea what connectors you are using, all it sees is an impedance of the load. SO if you had a pair of 8 ohm cabinets, you could connect one to the amp with speakon and one with bananas, all the amp will know is 4 ohms.
I see some rack mounted units with input jacks on both the front and rear panels, wired together.
I see some rack mounted units with input jacks on both the front and rear panels, wired together.
Thanks for all replys!
Since it’s my build, i try to make it even better... flipflopping between various possibilities and all tha...
Since it’s my build, i try to make it even better... flipflopping between various possibilities and all tha...
I would decide on one connector or the other, so there are no accidents connecting two devices at once. You might know what to do, but there is always the ignorant person who will try something behind your back...
This depends what for you use it.
I use a SP9 Audio Resarch Pre Amp. This has one SIGNAL OUTPUT, and be informed that this PREAMP has also a TUBE OUTPUT Line Drive.
As I have several Power amps and I was lazy to change cables all the time from switching one to the other Power amp, I added a second output JACK to the rear of the SP9, to connect the Second Amplifier. Checked the Circuit of that SP9 and connected the second output exactly the same way to the output Jacks. Actually this shouldn't be a problem, but it is.
If both amps are switched on then listening quality is almost the same as only one would be connected. have drops in super high frequencies,
If only one Amp is switched on then this does not happen.
If both amps are switched on and I switch off one Amp at the time while the second one is still running then I hear the DISCHARGE of the AMPLIFIER which I had switched off for a short time of period, in the loudspeaker of the AMP which is still running, because the Input of both amps are still connected at the output of the SP9.
I have to say all my amps have fasts inputs.
The only way to get rid off this except removing the cables, is to build a splitter so that noise from one amp while switching off wouldn't enter the other amp at input signal level.
But installing a splitter, would mean more Signal Split because this would be there even only one amp would be switched on.
And I would lose the quality of that Tube sound of the Line drive of the SP9.
So I live with the switching off noise on the second Amp which will last at max 10 seconds..
I hope this answers your question about doubling or installing two sets of connectors at the output..
It is no problems for Power Amps as long as the AMP can handle the load, but it will definitely be a problem at the output stage of a LINE DRIVE if these are not be made very well before the output Jack, so that it can handle the second output Jack without transferring the generated noise to the PRIMARY output Jack from the second connected device while switching on or off..
Regards from Bern
Chris
I use a SP9 Audio Resarch Pre Amp. This has one SIGNAL OUTPUT, and be informed that this PREAMP has also a TUBE OUTPUT Line Drive.
As I have several Power amps and I was lazy to change cables all the time from switching one to the other Power amp, I added a second output JACK to the rear of the SP9, to connect the Second Amplifier. Checked the Circuit of that SP9 and connected the second output exactly the same way to the output Jacks. Actually this shouldn't be a problem, but it is.
If both amps are switched on then listening quality is almost the same as only one would be connected. have drops in super high frequencies,
If only one Amp is switched on then this does not happen.
If both amps are switched on and I switch off one Amp at the time while the second one is still running then I hear the DISCHARGE of the AMPLIFIER which I had switched off for a short time of period, in the loudspeaker of the AMP which is still running, because the Input of both amps are still connected at the output of the SP9.
I have to say all my amps have fasts inputs.
The only way to get rid off this except removing the cables, is to build a splitter so that noise from one amp while switching off wouldn't enter the other amp at input signal level.
But installing a splitter, would mean more Signal Split because this would be there even only one amp would be switched on.
And I would lose the quality of that Tube sound of the Line drive of the SP9.
So I live with the switching off noise on the second Amp which will last at max 10 seconds..
I hope this answers your question about doubling or installing two sets of connectors at the output..
It is no problems for Power Amps as long as the AMP can handle the load, but it will definitely be a problem at the output stage of a LINE DRIVE if these are not be made very well before the output Jack, so that it can handle the second output Jack without transferring the generated noise to the PRIMARY output Jack from the second connected device while switching on or off..
Regards from Bern
Chris
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Chris, wouldn't it make sense to install a RCA switch between the preamp and your two power amps? That way, only one power amp would be connected to the pre at a time.
I'm not a friend of Cutting input rails to many times
Yes thought of this already, but you see there are instances where I like to listen to 3 Amps at the same time over three different Sets of Loudspeakers, and then the Switch will become a problem.. Except I will use a Rotary Switch in a box. (not going to make other holes into that SP9) as I used some already existent JACKS of the SP9 - Jacks there is no use of..
And I'm not a friend of cutting Input Rails more than necessary..
About the AMPs
The top one is Class A - Build 2020 October and Exchanged the AMPS inside to newer Version with more STABLE POWER @2Ohms using 6Parallel Output Transistor instead of only 2. almost same circuit of the one in 2020..I installed the AMPS 2 week ago if I remember right. Driving the IQ4 Series Speakers with 3.8 Ohms measured at the Port of the Speakers. The Drivers are all VISTA Speaker. this Pair has been build 2002 at least from what I know. Never been repaired all original, very good sound
The middle Amp is driving the Shelf Speakers, the 5 inch are SERIES 2000 B&W very good also, never repaired as well
Both of these Amps build in 2013 respectively in 2017 I have already placed pictures in an other thread of mine.
The top speakers are unknown brand, got them from a friend and these are connected with the B&W in Parallel, so there we get 2.5 Ohms, running on the middle CLASS A - also Single end but with Common Current Source instead of the Resistors you can see on the Single End of 2020. This one has been build in 2017 September, and since I took some of the DESIGN from the AMPLIFIER from DOZ designed by ROD ELLIOT, Australia, I send him all the new Created Circuits to look at. We had a nice talk about it.. So he knows that some of his Thoughts are in two of my Amps, even it's only a Gain control of the input..but it's his design so Awards please to him.
The Amp on the floor is about the same as the one in the middle and was build 2013 - same as the one in the middle it has some designs of ROD ELLIOT involved, partwisely in the INPUT STAGE, Output common current source is the right Name I think.
both of these CLASS A running on +- 48Volt Rail voltage, with 2AMP bias for the one on the floor and the one in the middle it's BIAS is 2.75 AMPS and it takes 3 Fans / Side to keep this one COOL @80Degrees Celsius. But I had this one running on 120degrees Celsius and more and it never broke down. Output Parallel 10 Pieces MJL4281 Per side, as most of my amp..
The one on the floor is running the Speaker in my Bedroom, just small ONKYO 5 inch Shelf Speakers 4 Ohms. I have another class A in my Bedroom to listen too but the FANS are too loud when listening for a long time, and that's why I use the one in the living room running 10 meter Loudspeaker Cables.. And this one is controlled via Remote control to adjust loudness.
Thanks for the Input..
I'm building a Preamp - Line drive Full CLASS A, Single END at present time, and there I will solve that problem with input Cable connections, including to connect the SP9 as well at the same time with minimal Loss at the same time, and no more problems of connection more than one amp at the same output of a line drive.
Regards from Bern Switzerland where we again have snowfall at present time..
Chris
Yes thought of this already, but you see there are instances where I like to listen to 3 Amps at the same time over three different Sets of Loudspeakers, and then the Switch will become a problem.. Except I will use a Rotary Switch in a box. (not going to make other holes into that SP9) as I used some already existent JACKS of the SP9 - Jacks there is no use of..
And I'm not a friend of cutting Input Rails more than necessary..
About the AMPs
The top one is Class A - Build 2020 October and Exchanged the AMPS inside to newer Version with more STABLE POWER @2Ohms using 6Parallel Output Transistor instead of only 2. almost same circuit of the one in 2020..I installed the AMPS 2 week ago if I remember right. Driving the IQ4 Series Speakers with 3.8 Ohms measured at the Port of the Speakers. The Drivers are all VISTA Speaker. this Pair has been build 2002 at least from what I know. Never been repaired all original, very good sound
The middle Amp is driving the Shelf Speakers, the 5 inch are SERIES 2000 B&W very good also, never repaired as well
Both of these Amps build in 2013 respectively in 2017 I have already placed pictures in an other thread of mine.
The top speakers are unknown brand, got them from a friend and these are connected with the B&W in Parallel, so there we get 2.5 Ohms, running on the middle CLASS A - also Single end but with Common Current Source instead of the Resistors you can see on the Single End of 2020. This one has been build in 2017 September, and since I took some of the DESIGN from the AMPLIFIER from DOZ designed by ROD ELLIOT, Australia, I send him all the new Created Circuits to look at. We had a nice talk about it.. So he knows that some of his Thoughts are in two of my Amps, even it's only a Gain control of the input..but it's his design so Awards please to him.
The Amp on the floor is about the same as the one in the middle and was build 2013 - same as the one in the middle it has some designs of ROD ELLIOT involved, partwisely in the INPUT STAGE, Output common current source is the right Name I think.
both of these CLASS A running on +- 48Volt Rail voltage, with 2AMP bias for the one on the floor and the one in the middle it's BIAS is 2.75 AMPS and it takes 3 Fans / Side to keep this one COOL @80Degrees Celsius. But I had this one running on 120degrees Celsius and more and it never broke down. Output Parallel 10 Pieces MJL4281 Per side, as most of my amp..
The one on the floor is running the Speaker in my Bedroom, just small ONKYO 5 inch Shelf Speakers 4 Ohms. I have another class A in my Bedroom to listen too but the FANS are too loud when listening for a long time, and that's why I use the one in the living room running 10 meter Loudspeaker Cables.. And this one is controlled via Remote control to adjust loudness.
Thanks for the Input..
I'm building a Preamp - Line drive Full CLASS A, Single END at present time, and there I will solve that problem with input Cable connections, including to connect the SP9 as well at the same time with minimal Loss at the same time, and no more problems of connection more than one amp at the same output of a line drive.
Regards from Bern Switzerland where we again have snowfall at present time..
Chris
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Good Morning Chris
This is interesting!
I was actually thinking of it for two reasons:
- use of superior (to rca) non-standard connectors (nim-camac by lemo)
- single wire/plug for left+right, like the din-plugs of the old days
- ability to provide standard connections to play around with other gear...
I have built a first back-panel on my f4, omitted rca, used lemo and a stereo-connector (totally non-standard)—and if I‘d build another one, I would test it first on a piece of wood to decide wether to use it at all...
Edit: quite an installation you have!
Very nice amps!
Edit: snow arrived here in Luzern, too [emoji849]
This is interesting!
I was actually thinking of it for two reasons:
- use of superior (to rca) non-standard connectors (nim-camac by lemo)
- single wire/plug for left+right, like the din-plugs of the old days
- ability to provide standard connections to play around with other gear...
I have built a first back-panel on my f4, omitted rca, used lemo and a stereo-connector (totally non-standard)—and if I‘d build another one, I would test it first on a piece of wood to decide wether to use it at all...
Edit: quite an installation you have!
Very nice amps!
Edit: snow arrived here in Luzern, too [emoji849]
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