the Poor Man 660 support thread

[delaymix]

Great job! fabulous design, certainly, I like the line that maintain their diy equipment.

It has end stops. But you can dissasemble it and put your own stops if you want.

It could explain a little how to position how to stop at the place you want?

Thanks.

 

[Silvas]

Great job! fabulous design, certainly, I like the line that maintain their diy equipment.

It has end stops. But you can dissasemble it and put your own stops if you want.

It could explain a little how to position how to stop at the place you want?

Thanks.

As the switches are plastic, you can unassemble one, then shove in your own stop in the position you want. It could be a thick component lead. Open one of the switches and you'll understand what i mean. I had to do this to repair the stop on one of these switches (i was testing how hard the stop was !)

 

[bernbrue]

Great job! fabulous design, certainly, I like the line that maintain their diy equipment.

It has end stops. But you can dissasemble it and put your own stops if you want.

It could explain a little how to position how to stop at the place you want?

Thanks.

As the switches are plastic, you can unassemble one, then shove in your own stop in the position you want. It could be a thick component lead. Open one of the switches and you'll understand what i mean. I had to do this to repair the stop on one of these switches (i was testing how hard the stop was !)

It´s quite easy. Cut a piece of plastic cable tie and put it in there as a stopper. Works really fine.
regards
Bernd

 

[lewilson]

Yes, My 670 is still working fine one year later. But I received no special banner :'(

 

[[silent:arts]]

Yes, My 670 is still working fine one year later. But I received no special banner :'(

sorry man, must have been the case and front panel why I missed it

but ok, here ya go:

 

[lewilson]

O.k, Now I can finally move on to the next project.  ;D

 

[king-rb]

today i had time for diy - the first time in the last six month so i tryed to solve the porblems with my pm 670.
if i insert only one 5687 on each channel the meaters are fine and i can adjust the rv3/6 but with two tubes per channel meaters wobble around. i tryed thre different sets of tubes. two sets (8tubes) "electron tubes" http://cgi.ebay.de/5687WB-Roehre-neu-new-5687-Tube-OTL-Headphone-Amp_W0QQitemZ390178298607QQcmdZViewItemQQptZR%C3%B6hren?hash=item5ad8705aef and one set "ge" which i had in the storage. same problem with all of them;-(

then i matched the tubes with the voltage @ r10 as refference. i got two pairs one with 10,4v @r10 and one with 10,8V. now the meters are fine and i can adjust rv3/6.
but now there is another problem if i switch the threshold of the "10,8v" channel both the meter of the other channel is chanching the zerro point.
if i understand this right i have to match 4 tubes with the same resulting voltage @ r10...
am i right? anyone got a tip where i can buy four good 5687 tubes?

EDIT: there is no problem with the audio going throu the channels! no distortion and the compression sounds great.
all other voltages seems to be fine except 245v which is 252v on the psu - is this a problem? and i should change the heater resistor when i got the tubes working right.

 

[Silvas]

today i had time for diy - the first time in the last six month so i tryed to solve the porblems with my pm 670.
if i insert only one 5687 on each channel the meaters are fine and i can adjust the rv3/6 but with two tubes per channel meaters wobble around. i tryed thre different sets of tubes. two sets (8tubes) "electron tubes" http://cgi.ebay.de/5687WB-Roehre-neu-new-5687-Tube-OTL-Headphone-Amp_W0QQitemZ390178298607QQcmdZViewItemQQptZR%C3%B6hren?hash=item5ad8705aef and one set "ge" which i had in the storage. same problem with all of them;-(

then i matched the tubes with the voltage @ r10 as refference. i got two pairs one with 10,4v @r10 and one with 10,8V. now the meters are fine and i can adjust rv3/6.
but now there is another problem if i switch the threshold of the "10,8v" channel both the meter of the other channel is chanching the zerro point.
if i understand this right i have to match 4 tubes with the same resulting voltage @ r10...
am i right? anyone got a tip where i can buy four good 5687 tubes?

EDIT: there is no problem with the audio going throu the channels! no distortion and the compression sounds great.
all other voltages seems to be fine except 245v which is 252v on the psu - is this a problem? and i should change the heater resistor when i got the tubes working right.

I had weird problems like these, all due to low heater voltage....when i pulled one 5687 per channel then readjusted the heaters resistor, everything went OK.

 

[king-rb]

with only one tube in each channel i get to big heater voltage 6.7v with two tubes per channel the heater drops down to 5.4v .. will do some testing

 

[Silvas]

with only one tube in each channel i get to big heater voltage 6.7v with two tubes per channel the heater drops down to 5.4v .. will do some testing

Same as me in the begining....

 

[kilmister]

Ok, new baby has born. 

I want to thank you Analag, [silent:arts] and everyone in this great great forum making this possible.

I bought this unit premade from Elektrovolt and today I finished it. During building time I've played lot's of different kind of music and instruments through it and it totally rocks! It can be really soft, almost unnoticeable or really hard and crunchy compressor.

It is almost "stock" unit. Exceptions are found in input and threshold gain, custom timing network and 6N5P tubes instead 6BC8 as suggested in thread.
I've measured fastest attack time nearby 2ms which I feel fast enought and I don't feel unit needs scamp board. Anyway there's no room left for it  ;D

My not so good english skill limits me to tell more details, so pictures tells more than thousend (bad finnglish) words:

Long live DIYing,
Paavo

 

[radiance]

What a lovely build...neat and tidy...nice frontpanel and all.

One question though: does it get hot with the top cover on?

 

[Holger]

Radiance, is answer is yes. This question was the first that came through my mind when I saw the pics, I can strongly recommend to left enough space in the rack.

 

[Silvas]

Beautiful job !

Really gorgeous front panel ! congratulations.

 

[lewilson]

Nice job.  Since I mentioned the 6n5p and 6k4p tubes the price is going up.  Maybe i made a mistake!

 

[[silent:arts]]

Paavo, I'm speechless 
how did you manage to squeeze all this in a 2U case
you will need water-cooling

and by far the most colored compressor I have seen ;D ;D ;D

 

[kilmister]

Gentlemen,
Thank you for your kind words

There's 2 reasons for 2U box.

1) Aesthetic. I'm building also couple of dual 1176 comps and made frontpanel layout for them well before bought PM project. So I had ready made "template" for this and upcoming projects. Full rack with same look and feeling units will rock  8)

2) Practical. Elektrovolt sent 3U case with project but it was only 300mm deep. I couldn't find solution how to spread all stuff there and wire everything nicely. I had unused modushop 2U box in home so I decided to use that after checking tubes can fit in.

Yes, unit runs really hot when top cover is on place. Obviously unit needs some free space over it. I'll propably change top cover to some sort of mesh or add fan in the box to keep it cooler.

-Paavo

 

[elektrovolt]

Wow, Paavo! great job
You made a fine looking machine out of it. I really like the front panel style.

Cheers!

Jimi

 

[SIXTYNINER]

very very nice - "****"  unit     

it sound better then a manley vari mu?
cheers

Ok, new baby has born. 

I want to thank you Analag, [silent:arts] and everyone in this great great forum making this possible.

I bought this unit premade from Elektrovolt and today I finished it. During building time I've played lot's of different kind of music and instruments through it and it totally rocks! It can be really soft, almost unnoticeable or really hard and crunchy compressor.

It is almost "stock" unit. Exceptions are found in input and threshold gain, custom timing network and 6N5P tubes instead 6BC8 as suggested in thread.
I've measured fastest attack time nearby 2ms which I feel fast enought and I don't feel unit needs scamp board. Anyway there's no room left for it  ;D

My not so good english skill limits me to tell more details, so pictures tells more than thousend (bad finnglish) words:

Long live DIYing,
Paavo

 

[kilmister]

it sound better then a manley vari mu?

Loan me one. I'll tell you then 
And thanks for **** ;D

-Paavo