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I'm done the Altecs - how's the tube x-over coming? [message #39885] Tue, 14 January 2003 07:23 Go to next message
billfort is currently offline  billfort
Messages: 34
Registered: May 2009
Baron
Finally finished my Altec 604 cabinet project and thought I'd share my progress - here's a link to a page with a few pictures.

All I need now is a tube active crossover, 12db slopes at 1500Hz, maybe a horn compensation network? :-)

How's the crossover project coming along Wayne?

Billfort

Re: I'm done the Altecs - how's the tube x-over coming? [message #39886 is a reply to message #39885] Tue, 14 January 2003 07:48 Go to previous messageGo to next message
wasteh202 is currently offline  wasteh202
Messages: 137
Registered: May 2009
Master
Beautiful! I am on the way to the 300B also. I just cannot afford it yet. I will probably begin with a pair of 2A3's from Bottlehead (Paramours monoblocks), and when I can afford the jump up go for a pair of Consonance Billie's (monoblocks also). The Billies have more power and more bass.

Your speakers are beatutfil and I like the way you made them to fit the corner.

Questions

What are you using for the XO, is it the origonal?

Is the box sealed or ported?

thanks


Re: I'm done the Altecs - how's the tube x-over coming? [message #39887 is a reply to message #39886] Tue, 14 January 2003 08:01 Go to previous messageGo to next message
billfort is currently offline  billfort
Messages: 34
Registered: May 2009
Baron
Thanks for the compliments. I heard the Billie last year in Lima - very nice - I'm about to start a scratch built 300B SET based on the WE91 circuit but if I was going to build a kit, the Billie would be it. Heard the Paramours a few times as well - they sounded great but they are only 2.5w - the right speakers are critical.

XO is the stock Altec unit that came with these drivers. The boxes are vented (triangular cut-outs in the cabinet sides) - tuned to 40Hz.

Billfort

tube crossover specs [message #39888 is a reply to message #39885] Tue, 14 January 2003 09:02 Go to previous messageGo to next message
Garland is currently offline  Garland
Messages: 269
Registered: May 2009
Grand Master
Hi Bill,

Wayne posted some suggestions for building up the PC boards for the 6DJ8 crossovers based on Steve Bench's design. The boards are available from Gary Kaufman. Hope this helps.

Re: I'm done the Altecs - how's the tube x-over coming? [message #39889 is a reply to message #39887] Tue, 14 January 2003 09:12 Go to previous messageGo to next message
wasteh202 is currently offline  wasteh202
Messages: 137
Registered: May 2009
Master
Thanks for the info
BTW [message #39890 is a reply to message #39887] Tue, 14 January 2003 09:51 Go to previous messageGo to next message
wasteh202 is currently offline  wasteh202
Messages: 137
Registered: May 2009
Master
I will be using a min of 96db sen speakers with the Paramour's.

The Paramours are rated at 3.5 wpc (not 2.5 wpc). I know that this is not a sigiificant difference but it can be depending on the speakers.

Spice model for 6DJ8 tube crossover [message #39891 is a reply to message #39885] Tue, 14 January 2003 12:42 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18787
Registered: January 2001
Illuminati (33rd Degree)
Here's a link to the thread that contains the model of the crossover circuit, in case you're interested. You can download the model and simulate the circuit to see its response curves. I suggest that you model the circuit while modifying values for R15, R16, R17 and C10 so you can see their effects. I'd also highly recommend that you analyze the circuit as it is without these components. I think you'll find it very interesting.
Re: Spice model for 6DJ8 tube crossover [message #39892 is a reply to message #39891] Tue, 14 January 2003 12:52 Go to previous messageGo to next message
billfort is currently offline  billfort
Messages: 34
Registered: May 2009
Baron
Is spice a free download Wayne?
Thanks, Billfort
Re: Dadoes for the bracing tell the story [message #39893 is a reply to message #39885] Tue, 14 January 2003 14:00 Go to previous messageGo to next message
BillEpstein is currently offline  BillEpstein
Messages: 886
Registered: May 2009
Illuminati (2nd Degree)
Excellent craftsmanship! And truly architectural design solutions to both the vents and the baffles. Wow!
Re: Spice model for 6DJ8 tube crossover [message #39894 is a reply to message #39892] Tue, 14 January 2003 16:01 Go to previous messageGo to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18787
Registered: January 2001
Illuminati (33rd Degree)
There are evaluation versions that are free, and the links in the post above have this free software. The evaluation versions of Spice are limited only in the number of nodes, and these circuits are simple enough that the node limitation is higher than the parts count of the circuit. So for this case, the evaluation version(s) of Spice will do everything you need.
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