Recent Posts

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Q & A / Sunn Model 14 Speakers and could they be used as a guitar cab?
« Last post by ShitFisto on December 04, 2017, 03:13:04 pm »
So I picked up a pair of Sunn Model 14 Speakers from Craigslist a few days ago and the only issue with them is they cannot register low frequencies cause the original owner of them chopped out the subwoofers (more than likely to make transportation easier).
My question is how could I run these speakers as a guitar cab? I have a power amplifier if need be and I have a Boss Katana Head. What I found when running the Boss Katana Head through the speakers was that when I tried to play my guitar these poor speakers were just releasing a harsh rattling. Could they need to be fixed? I'm really stumped here guys.
General Discussion / Hibish Design builds a Beta Lead clone - thoughts?
« Last post by measurestaken on December 01, 2017, 01:35:11 pm »
I gotta say, this thing looks pretty kickass. Granted, I could probably find a Beta Lead for less, but I can only imagine how much air this would move. Any thoughts from the team?
Q & A / Re: SUNN 300T one green LED turns red
« Last post by _peter on November 29, 2017, 07:02:12 am »
Hi Stewen,

did you try swapping the corresponding tube with the one next to it?
If the other LED changes color now, then the tube is the problem.
If it's still the same LED, then the fault is in the circuit.

Cheers, Peter
Classified / selling Sunn Model 5 PA speakers
« Last post by markko1962 on November 27, 2017, 06:43:56 pm »
Hi. I have for sale 2 Sunn Model 5 PA speakers for sale. All original except for One speaker in each cabinet. The speakers are loud and proud. I am scaling down my gear to get a few other items. Let me know if interested. I am asking 200 for the pair. I live in NE ohio and I do have the means to ship via LTL truck freight. They are about 99 lbs each.
Q & A / Re: 70s (vibrato/Reverb) footswitch wiring
« Last post by GrannyGremlin on November 27, 2017, 12:08:23 pm »
So I cleaned her up and decided to improve on the original (got extra poles on the switches anyway) by adding indicator LEDs


And after:

Ryan,will you sell me 1 of the Rogan knobs? I only need 1......
Q & A / SUNN 300T one green LED turns red
« Last post by Stewen on November 23, 2017, 05:45:03 pm »
Hallo !    This is my first post here and my problem is a MYSTERY !!    The amp has one bicolour LED  ( green /red)  for each pair of the six powertubes .  At start all three LEDS  glow red . After stand by on all turns green .....  but after 3-4 minutes one of them  (  for V9+V10)  turns back to red.   The green part of each "doubleLED"  is driven by a 2N4401  transistor .  All three transistors are OK.
Resistorchain 220k+220k + 4,7k to ground are OK.   At first all green LEDs show about 2,2 VDC at its anode ,  but after 3-4 minutes this anodevoltage slowly starts to raise up to about 3,6 VDC
and the red lights up .   The 4,7 k resistor has its upper end to the base of the transistor.   Please look at the schematic .   The only thing I can imagine is that the internal resistance in the green
LED is increasing and in a way therefore is chooking the transistor .....  That in turn increases the voltage to the gred side which turns on .      Id be very happy for some advice here .....
Im very  puzzled  .   The usual fault which shall turn the LED back to red is the connected fuse of 100mA to break or that the high voltage to the actual tubepair have gone away.....  or some
fault with the tubes involved .   A broken fuse here will disconnect the actual pair of tubes and the amp can still work with four outputtubes .......  In my case here nothing is wrong with the tubes
I just want all the "doubleLEDs to work properly.                                 Thanks for all comments                   Regards  Stewen
Classified / Sunn Model T First gen
« Last post by on November 19, 2017, 06:33:08 pm »
New tubes. New resistors. Plays great. Amp guru went through and fixed everything. It has some surface pitting on chrome surfaces, but that is to be expected. I am not going to do chrome paint or any dishonest practice.  Photos are on Daytona Beach  I live in New Smyrna Beach,FL. I have had this amp for 15 years. Asking $2000.00 or best offer. Prefer local pickup. I can arrange shipment through local music store or Guitar Center (I don't know if GC will do that but I know local honest music stores that will check amp and ship for a fee).
Q & A / Re: Sunn Sceptre Cabinet Driver question. Which drivers are original?
« Last post by Whipsaw on November 18, 2017, 08:02:54 am »
Thanks for your input Granny and Ed. I'm going to wait for a driver to show up matching the other 3 exactly. The cabinet is definitely worth putting new drivers into at some time in the future. I have a vintage Deluxe Reverb (1979) that I had blackfaced.... the 1969 Sunn Jensen C12N will go in that rather than the Italian Jensen C12N I put in it and see what the difference is.
Q & A / Re: Sunn Sceptre Cabinet Driver question. Which drivers are original?
« Last post by GrannyGremlin on November 17, 2017, 09:07:32 am »
They were very common, as I alluded to CTS was a huge source for generic speakers. Those drivers were in lots of things, not just guitar cabs. They were built with all sorts of cone configurations depending on what the end users application was. You could probably find them with whizzer cones in inexpensive full range cabinets.


I'm pretty sure they were also used as Fender labelled guitar drivers in the 60's into the 70's. They are good drivers, but not real "high end" quality, and were very inexpensive, so many low end to medium quality stereo, guitar, organ, PA manufacturers used them.
That doesn't mean they are crap, the reason they were so prolific is because they were a lot of bang for the buck, and waaaaay cheaper than JBL, Altec, EV, etc.

Yes, these frames were used for everything, bnut as you kinda mention in your second sentence the cones and voicecoils and other parts (that have much more impact on performance and tonality) varried by application.  Hifi drivers would have much softer suspensions.  Whetehr they are good or not depends on (besides personal preference) which config you are looking at and what you intend to use them for.  That said the difference between a guitar and (fullrange) hifi or PA driver wasn't as great back then as it is now, but I have used hifi drivesrs of this vintage for instrument use with good results (just make sure you are not giving them anywhere close to their limit as regards power handling).

I prefer this style (I'm Canadian, so mostly Marslands for me, but same thing really) for guitar, but for bass it's the higher end stuff all the way (EV is my fave but JBLs too).  I do have a 4x12 with a pair of JBls in it though, for something different - use that one for both guitar and bass (in parallel with a 1x15 reflex horn loaded with an EV - very similar to the Sunn bass cabs in design but this one is a Musicman).  The thing that is great about those Sceptre cabs is that they actually have more internal volume than a standard 4x12, so you can stick some heavier duty drivers in there (like JBLs or EVs - even cast frame Eminences but personally I am not a fan) and they work great for bass or dual use guit/bass or even organ cabs.  You can experiment with stuffing them to tune them to the drivers and get a bit more low end.
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