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paul
Joined: Feb 22, 2005
Posts: 31
Location: Italy
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 Posted: Wed Feb 23, 2005 6:10 am Post subject:
Sound Lab's 2K PT146 |
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Hi Crew,
at the end I got the 2K PT146! 
How can it reach the best output, coupled on the top of the 2N3904 or coupled to the vertical plate side 
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paolo ferrari |
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Alex_D_Steak
Joined: Feb 17, 2005
Posts: 40
Location: Switzerland
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| Posted: Wed Feb 23, 2005 7:26 am Post subject:
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Hey Paul!
it would be nice to share with us the place where you got them...
I don't have at hand your email, are those available also in Italy?
looking to meet you soon!
ciao
Alex
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paul
Joined: Feb 22, 2005
Posts: 31
Location: Italy
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| Posted: Wed Feb 23, 2005 12:31 pm Post subject:
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Hey Alex, nice to hear from you here!
If you have credit card and you are use to buy on the web (I'm not), get them from Precision Resistor Co. - Florida (see for details on Sound Lab project). If not, buy to Findis - Milan (the Italian dealer for PRC).
I got 25 pcs. at Euro 7,80 each one (VAT not included). They have no stock and take about 6 weeks delivery time 
Hope it can help you and keep me informed
ciao
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paolo ferrari |
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Alex_D_Steak
Joined: Feb 17, 2005
Posts: 40
Location: Switzerland
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| Posted: Wed Feb 23, 2005 4:26 pm Post subject:
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Oh my god  not so cheap eh?
Maybe you can sell me 4 or 5 pieces 
ciao
Alex
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adhdboy
Joined: Feb 16, 2005
Posts: 57
Location: denver
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| Posted: Tue Mar 01, 2005 5:56 am Post subject:
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Hi all
I posted a cool mod for the Sound Lab. A Sample and Hold circuit which is a nice way to generate some voltage changes that can be used to control the synth to create repeating or random patterns of notes.
There is a link to it on the main page of:
Music From Outer Space
I noticed that the site was not responding this morning. It looks like LunarPages is not off to a good day which is a very rare event. I'm sure they will have it fixed in no time so please be patient. 
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paul
Joined: Feb 22, 2005
Posts: 31
Location: Italy
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| Posted: Wed Mar 02, 2005 8:57 am Post subject:
Re: Sound Lab's 2K PT146 |
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| paul wrote: | Hi Crew,
at the end I got the 2K PT146!
How can it reach the best output, coupled on the top of the 2N3904 or coupled to the vertical plate side
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adhdboy, where the PT 146 have to be coupled exactely?
thank you
ciao
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paolo ferrari |
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adhdboy
Joined: Feb 16, 2005
Posts: 57
Location: denver
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| Posted: Wed Mar 02, 2005 6:59 pm Post subject:
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Hi Paolo
You want them to be at the same ambient temperature as the transistors so it would be a good idea to glue one to each pair of transistors or even put culk or silicon around each set of transistors and temperature compensating resistor. That way air currents won't get either of them to change temperature separately. Some people glue the components together and then make little cardboard boxes around them to keep air currents from again changing the temperature of one component and not the other. ARP used to pot their circuits to both keep snooping eyes away and to keep the components at the same ambient temperature.
I hope this helps.
Ray
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paul
Joined: Feb 22, 2005
Posts: 31
Location: Italy
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| Posted: Fri Mar 04, 2005 7:35 am Post subject:
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Thank you adhdboy!
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mosc
Site Admin
Joined: Jan 31, 2003
Posts: 18202
Location: Durham, NC
Audio files: 213
G2 patch files: 60
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| Posted: Fri Mar 04, 2005 9:59 am Post subject:
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| adhdboy wrote: | | ARP used to pot their circuits to both keep snooping eyes away and to keep the components at the same ambient temperature. |
Hee hee. I remember in the 70s people had all kinds of secret formulas that were said to be able to dissolve the Arp potting compound so you could reverse engineer their synths. I guess today we'd call these stories urban legends.
The very early Moog modulars were built with photosensitive transistors and if you removed the backs of the cabinets they would drift all over the place. This was discovered by people at the famous Different Fur Trading Company recording studio in San Francisco. They bought a big Moog modular system and has a special clear plexiglass case built for it. Needless to say, they were very disappointed. 
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my music and other stuff |
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