Recent Posts

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Q & A / Re: Newer 215 bass cabs vs Older
« Last post by VoltaTerminal on June 18, 2018, 09:49:29 am »
I think most of the "magic" in the older Sunn cabs was in the JBL D140 drivers they many came with. I don't have experience with the later Fender/Sunn cabs, however the advances in transducer technology over the years would indicate that they are probably fine, just don't pay "vintage Sunn" dollars. Current light weight neodymium cabs have driven run of the mill big cab prices way down.
What are you driving the cab with?

I'm expecting to get a GK 800RB. My current head is an Acoustic 140 whose transformer just gave out. I just purchased the Sunn 215 off reverb for super cheap so I'm hoping that if I want to replace the drivers I can without breaking the bank.
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Q & A / Re: Newer 215 bass cabs vs Older
« Last post by Isaac on June 18, 2018, 08:18:38 am »
I have a Sunn Model 215 cabinet. I replaced the original drivers with JBL 2205B drivers, which are essentially K140s without the aluminum dome. It sounds very good. I think the cabinet is tuned to a higher frequency than is ideal for the JBLs, but maybe it's a good tuning for the original drivers.
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Q & A / Re: Newer 215 bass cabs vs Older
« Last post by EdBass on June 18, 2018, 06:36:37 am »
I think most of the "magic" in the older Sunn cabs was in the JBL D140 drivers they many came with. I don't have experience with the later Fender/Sunn cabs, however the advances in transducer technology over the years would indicate that they are probably fine, just don't pay "vintage Sunn" dollars. Current light weight neodymium cabs have driven run of the mill big cab prices way down.
What are you driving the cab with?
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Q & A / Newer 215 bass cabs vs Older
« Last post by VoltaTerminal on June 17, 2018, 01:10:51 pm »
I recently played through a really great sounding Sunn 215 at a show and I love the sound I got out of it. I didn't get much information from the owner other than that it's a model from the 70's. I'm in the market for a cab anyway and the 2x15 seems like the way to go. I've found a few for sale online but they are the fender made models. I know that the post fender heads don't get much love but does this apply to the cabs as well? Assuming these cabs have the stock drivers in them are they worth acquiring?
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Classified / Re: 10 NOS rogan knobs for early sunn amps - pointer style
« Last post by madaradio on June 10, 2018, 06:54:00 am »
Sold. Thanks everyone.
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Q & A / Re: Original Model T questions.
« Last post by _peter on May 24, 2018, 01:36:48 am »
Don't worry, that's just the way they build amps back in the days.
I can't make out any component in the picture that has been touched.
Maybe, after all these years, the amp might need a cap job.

Peter
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Q & A / 76 Red Knob Concert Lead Output Transistors
« Last post by bigmufffuzzwizz on May 23, 2018, 09:00:33 pm »
I’ve got a red concert lead on my bench.  I’ve come to the conclusion from testing that Q3  is bad (reading voltage from collector to emitter). This unit has 22-3155 7613 transistors (not available) instead of the still available 2n3055 listed on the scheme. Are these interchangeable? Considering the scheme should I replace all 5 Q’s with 2n3055 like the original scheme? Can I just replace one or need they be changed in pairs similar to tubes?
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Q & A / Re: Inexpensive speaker repair suggestion.
« Last post by GrannyGremlin on May 23, 2018, 12:03:25 pm »
Nice clean tear - easy to fix.

Don't use epoxy - too heavy.  Rubber/contact cement only if it's a poly cone vs paper.  For a paper cone like this one use regular white/school glue.  Water it down a bit so it doesn't go on thicker than necessary, dries slower, and paints on with a brush easier (though sometimes I just finger it on).  Alternatives include Wood Glue and  Modge Podge (in both cases def water down) - both being water based as well and very similar.

Paper towel is a bit thick - I use toilet paper (if thick/multiply, use a single ply).  Layer of glue on both front and back, line up the tear, stick on TP patch on rear only ( don't want to see that from the front), and then paint over the patch with another layer of glue (watering it down as mentioned also helps is not rip the TP when you top coat). Optionally another coat on the front as well if you're worried it's not strong enough.  Be conservative with the glue - you can always add another coat later.

Basically you don't want to add significant weight in an unbalanced way. That can be bad.  Adding weight in a balanced way (e.g. paint the entire cone with watered down glue/mod podge) is a common mod in DIY HiFi circles for cheap drive units when you want to lower the resonance/bass response and don't mind risking the loss of a bit of high end (cuz there's a tweeter for that anyway).  I've repaired many a low power vintage alnico this way (reconing is not worth it - costs more than replacing the speaker).  After a few you even learn to make them not so damn ugly.

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Q & A / Re: Inexpensive speaker repair suggestion.
« Last post by bigobassman on May 22, 2018, 06:31:30 pm »
I've repaired several splits like you have.  You need a sheet of paper towel and some flexible rubber glue/cement that is applied with a brush.  Cut a strip of paper towel a little larger than the tear.  Apply a layer of glue around the tear and then lay the paper towel section as smooth as possible over it.  Then put a layer of glue over the top of the towel extending out on the cone some.  If possible, do the back side as well.  Works great!   :-)
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Q & A / Re: Original Model T questions.
« Last post by RacerX on May 22, 2018, 08:19:58 am »
Hi _peter, Thanks for confirming it is stock. In the 80’s I bought a kit to modify my guitar for “killer tone” from the back of a guitar magazine. It consisted of some resistors, capacitors and other things that we’re to be soldered between the pots, pick-ups and switch. When it was completed it sort of looked like the inside of this amp. It just had this homemade look with electical parts soldered in places and that is what the inside of this Model T reminded me of.
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