Daily!
I guess you will like this:
Kvart & Blge | Audiophile Quarter Wave Full Range Speakers
(and this, of course: The Wall of Sound" )
Cheers, E.
Hi John,
I guess you will like this:
Kvart & Blge | Audiophile Quarter Wave Full Range Speakers
(and this, of course: The Wall of Sound" )
Cheers, E.
The problem is you have to listen to GD the haggis of music.
https://www.youtube.com/watch?v=VP08Y3DsJvs
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There are definitely some GD songs that are just so classic, they will always have a place with those who listen to rock and roll. Now what I was never interested in was the social part of that band, the hardcore groupies that followed them around. Perhaps it was the Acid or whatever it was that they were taking, but to hear the same thing night after night would just get old. but then again I was not into the hippie commune thing, the counter culture was so much a part of that bands following. Sort of like the followers of Talking Heads or Devo, I just don't get that monotonic devotion myself.
The key is that it wasn't the same thing night after night. Unlike the vast majority of touring rock bands, every set was different.
Sy,
I know our mutual friend Airto was friends with Mikey Hart, they played together many times. That would be great that there were set changes from night to night, perhaps they couldn't remember what they played the night before!
I know our mutual friend Airto was friends with Mikey Hart, they played together many times. That would be great that there were set changes from night to night, perhaps they couldn't remember what they played the night before!
At least this live set on Beat Club , Bremen , Germany , sounds very very good ,https://www.youtube.com/watch?v=H6Uu57h7H18 (my heat down to that studio sound engineer who was recorded that live performance .)
On a totally unrelated topic, I am currently going through my collection of five General Radio Sound Survey meters. I buy these on eBay for under $25.00 each. They are ceramic microphone, vacuum tube based handheld sound level meters. They are A, B & C weighted. My oldest one is serial #175, the newest #5352. Minor changes between them. Now I used to be able to get Eveready #413 30 volt batteries made in China, but they are almost impossible to get. However someone is making a modern alkaline version. As the good meters only draw 400 uA, the B+ battery life is good. The C cell used for the filaments also is used for biasing.
Now virtually none of the meters come in working condition. Many of the capacitors are metal case glass sealed oil paper, but some are unsealed. The normal failure mode is to find the plate voltage on V1 as shown in the attached schematic drops to 2 volts or so. I think from the schematic it is obvious were the issues are.
The reason why I like these meters so much is the sensitivity is set with a potentiometer. This allows me to set the gain so it reads zero during a pink noise system setup. Then anyone can identify where the level is off by more than (for example) 3 dB. If the sound source are 70 volt loudspeakers then any electrician can turn the transformer taps up or down as needed.
Now the unit does use pencil tubes and so far none of them have seen enough use that the tubes have failed. But I do have a source of new (old stock) ones.
Now virtually none of the meters come in working condition. Many of the capacitors are metal case glass sealed oil paper, but some are unsealed. The normal failure mode is to find the plate voltage on V1 as shown in the attached schematic drops to 2 volts or so. I think from the schematic it is obvious were the issues are.
The reason why I like these meters so much is the sensitivity is set with a potentiometer. This allows me to set the gain so it reads zero during a pink noise system setup. Then anyone can identify where the level is off by more than (for example) 3 dB. If the sound source are 70 volt loudspeakers then any electrician can turn the transformer taps up or down as needed.
Now the unit does use pencil tubes and so far none of them have seen enough use that the tubes have failed. But I do have a source of new (old stock) ones.
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Does anyone know of some BC337-40/327-40 replacements that have similar noise and SOA? Preferably TO92?
Why a replacement? Mouser has a somewhat confusing P/N for the Pb-free BC327-40, which omits the hyphen. Same for the Pb-free BC337-40. Both are cheap and in stock.
The old process was labeled 14 for the NPN, process 67 for the PNP. But I think the high-runner TO-92 parts are the BC ones.
Well, I was thinking of the OnSemi parts which are the fastest out of the manufacturers. They are discontinued.
Also according the the On datasheet, quite a bit lower voltage and no beta bracketing. Best to avoid.
BTW be sure to check the pinout of the Fairchilds. There appears to be a typo in the datasheet for the numbering of the leads.
OnSemi has 3 Hfe groups:
http://www.mouser.com/ds/2/308/on semiconductor_bc337-d-547753.pdf
Some 3x7 datasheets don't show them. Datasheets are unreliable. Almost all of the BC3x7-40 I have measured have had very close to 400 Hfe.
I can't see any voltage difference from the Fairchild datasheet:
http://www.mouser.com/ds/2/149/BC337-193546.pdf
The main relatively common ground between the 3x7 datasheets of various manufacturers is the SOA and Hfe groupings. The other parameters are highly variable.
http://www.mouser.com/ds/2/308/on semiconductor_bc337-d-547753.pdf
Some 3x7 datasheets don't show them. Datasheets are unreliable. Almost all of the BC3x7-40 I have measured have had very close to 400 Hfe.
I can't see any voltage difference from the Fairchild datasheet:
http://www.mouser.com/ds/2/149/BC337-193546.pdf
The main relatively common ground between the 3x7 datasheets of various manufacturers is the SOA and Hfe groupings. The other parameters are highly variable.
For some reason I found an On Semi datasheet that indicated a lower breakdown voltage and no beta bracketing---but I didn't save it. I'm glad to know otherwise.
Sometimes you go to Asia without a guide and fall into something like this and just scratch your head. https://www.youtube.com/watch?v=4p0DsVPkyZg
I've been extremely pleased with the quality I've received from Rochester Electronics. They are a US based company and their shipping costs outside the US are high. But I'm in California and I find the costs quite manageable.
Luckily they are indexed by octopart.com. Here is a small snippet from the huge amount of output provided by octopart.
I recommend purchasing at least 500 of each part type. To buy 500 NPNs and 500 PNPs you'll pay less than a bottle of Champagne at a fancy restaurant. You want to do this and do it now, if you're worried they're no longer produced.
_
Luckily they are indexed by octopart.com. Here is a small snippet from the huge amount of output provided by octopart.
I recommend purchasing at least 500 of each part type. To buy 500 NPNs and 500 PNPs you'll pay less than a bottle of Champagne at a fancy restaurant. You want to do this and do it now, if you're worried they're no longer produced.
_
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