P901
Member
Just wanted to send out a note of thanks to Q-Bob and everyone for all their advice and help during the rebuild of the 7001. and the system setup.
Completed the recap of the 1st 7001 unit, (still in the lab for other internal mods), but I was able to play the decoder boards in the backup unit last night. (Recapped with matched Panasonic low leakage, tight tolerance FC series electrolytics, [equivalent to the Nichicon "Muse" audio series], along with changing all the original mylar and polyester caps to P series polypropylenes, also matched).
Night and day as they say.
Somewhere in one of these posts someone made the comment that, without a rebuild, these units are a shadow of their original state.
This statement is true.
For those who are considering this type of a rebuild / upgrade, you will be pleasantly rewarded.
Noticed a physical effect while running the unit last night, the power output before was such that it took a volume setting of "7" or so to make the window by my desk rattle. Now the window is shaking in its frame and I was unable to focus on the computer screen due to the vibration directly affecting my vision, this now happens at a volume setting of "3". Of course, clarity, range and punch all dramatically improved
No other changes to the reference system, (7001 with inital internal "cleanup mods"), except for recapped/balanced decoder boards.
Next mod is to try to find the point on the circuit board to cut in a discrete multichannel input to mimic the input of the CD-4 system. The goal is to have the unit process the discrete signal with CD input as it did with the original phono source.
Of course we don`t have a 50khz carrier so this cut in will need to be downstream of the CD-4 components, (which have been surgically removed anyway since this unit is used only with CD input).
Also taking into account that the recordings on the CD`s have not been mixed for this purpose but great opportunity for experimentation.
Anybody??
Thanks again to Q-B, the Quadfather and all who have offered their time, advice and assistance to get a new guy up and running.
andy
Completed the recap of the 1st 7001 unit, (still in the lab for other internal mods), but I was able to play the decoder boards in the backup unit last night. (Recapped with matched Panasonic low leakage, tight tolerance FC series electrolytics, [equivalent to the Nichicon "Muse" audio series], along with changing all the original mylar and polyester caps to P series polypropylenes, also matched).
Night and day as they say.
Somewhere in one of these posts someone made the comment that, without a rebuild, these units are a shadow of their original state.
This statement is true.
For those who are considering this type of a rebuild / upgrade, you will be pleasantly rewarded.
Noticed a physical effect while running the unit last night, the power output before was such that it took a volume setting of "7" or so to make the window by my desk rattle. Now the window is shaking in its frame and I was unable to focus on the computer screen due to the vibration directly affecting my vision, this now happens at a volume setting of "3". Of course, clarity, range and punch all dramatically improved
No other changes to the reference system, (7001 with inital internal "cleanup mods"), except for recapped/balanced decoder boards.
Next mod is to try to find the point on the circuit board to cut in a discrete multichannel input to mimic the input of the CD-4 system. The goal is to have the unit process the discrete signal with CD input as it did with the original phono source.
Of course we don`t have a 50khz carrier so this cut in will need to be downstream of the CD-4 components, (which have been surgically removed anyway since this unit is used only with CD input).
Also taking into account that the recordings on the CD`s have not been mixed for this purpose but great opportunity for experimentation.
Anybody??
Thanks again to Q-B, the Quadfather and all who have offered their time, advice and assistance to get a new guy up and running.
andy
