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Q & A / Ohms of the spectrum 1
« Last post by Wizardsleeves on July 18, 2017, 10:56:04 am »
Hi everyone
I bought a spectrum 1 yesterday. Loving it so far we'll see how it holds up. My question is what are the ohms the spectrum 1 puts out with one speaker and what with two?
Thank you
DIY / Re: Closest SUNN Model T clone ever?
« Last post by _peter on July 17, 2017, 11:38:10 pm »
Hi Marco,

thanks! I played it through two London City cabs loaded with Celestions...
G12H30s I believe, but not 100% sure.

Q & A / Re: schematics? where is the schematics download location?
« Last post by Wizardsleeves on July 17, 2017, 04:47:02 pm »
I'm looking for a schematic for the Sun Spectrum 1. No luck on the Hoffman site. Any pointers, anyone? Greatly appreciated, thanks.
DIY / Re: Removing Paint from Tolex
« Last post by N2000s on July 14, 2017, 09:01:18 pm »
I tried everything and what worked the best was the "GOJO Orange hand cleaner." That and a wire brush did very well on an amp I had.
DIY / Re: Closest SUNN Model T clone ever?
« Last post by Fuzzonaut on July 12, 2017, 05:57:30 am »
Hi Peter,

Well, I think this is amazing! Well done!

If it sounds just half as good as it looks, whoever can plug into it must be very, very happy.
What cab is used with it?


Q & A / Re: Cone Excursion
« Last post by Isaac on July 11, 2017, 08:07:27 am »
Sounds as though you have the problem solved, Eddie. What I think was happening, touched on by both G and Ed, was that the high fidelity, full range amp was putting out frequencies that were lower than the tuning frequency of the speaker cabinet. When that happens, the driver is no longer loaded acoustically. That is, there is no "air spring" to prevent the driver from flopping about, and can lead to the driver exceeding its excursion limits and even damaging the driver. Using a high pass filter, as you are doing, will prevent that. As G mentioned, tube amps have lower damping factors, and a high damping factor will also help by electrically suppressing excessive excursion.

A lot of amps, even old Sunn tube amps, limit frequency response. IIRC, the 200S rolls off the low end at 80Hz, 40Hz with the LOW BOOST engaged (so it's not really a low boost, just extending the low end by an octave). I don't see a lot of cone excursion when using the 200S. On the other hand, I don't think that the Sceptre line (and my Sentura, etc.) are rolled off anywhere near that high. There's a -6dB shelf in the response on the low end (I don't remember the frequency), but the low end roll off occurs much lower, which is one reason those amps make such nice bass amps. And with my Sentura II, I do see much higher cone excursion.
Q & A / Re: Cone Excursion
« Last post by Soundmasterg on July 10, 2017, 06:08:12 pm »
  By the way, Soundmasterg, I am in your debt.  Your postings about cap replacement, in our modern age, has been my guide to reconditioning my amp.  Thanks!

You're welcome, glad to help!

General Discussion / Re: Beach Boy PA Question
« Last post by Novella on July 10, 2017, 06:03:14 pm »
Here are more photo
General Discussion / Beach Boy PA Question
« Last post by Novella on July 10, 2017, 05:57:20 pm »
Wondering if anyone has anymore info on this amp. Have been talking to Conrad via email and this was what he said "This could be the original unit.  Very early.  So early I don't remember this one." Does anyone have photos of the original beach boys unit, or does anyone know how many Beach Boy Pa's were produced before it became the coliseum pa. Any info would be great I attached some photos.
Q & A / Re: Cone Excursion
« Last post by eddiemac on July 10, 2017, 01:31:05 pm »
Update: I bought an fDeck HPF Series 3, which is a variable frequency high pass filter, adjustable from 35 to 140 Hz.  It effectively tames the low frequency cone excursion that bothered me when using my Sunn Sorado into a 1-15" cab.  The amp will see more use now.
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