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January 22, 2022, 06:45:19 PM

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Amplifier Discussion / Panasonic AN17827A chipamp?
« Last post by smadin on Today at 09:42:11 AM »
Has anyone worked with this IC? Digikey lists it as obsolete, but has ~500 in stock, quite cheap—$0.91, $0.75 in quantities of 10+. My (not-very-educated) guess is that it isn't very good, but the datasheet says it can put 2.5W into 8Ω, with an 8VDC supply, so I wondered if for the price it might be fun to experiment with.
Guitar News / Re: Famous guitarists who play solid state amps
« Last post by willpirkle on January 19, 2022, 10:29:13 PM »
Alex Lifeson recorded Power Windows with a GK250ML, Dave Murray and Adrian Smith from Iron Maiden used the GK2100SEL in the early 90’s, Bob Weir used a McIntosh MC-2300 solid state power amp with a Furman preamp in the early/mid 70s. Wes Montgomery used a Standel Super Custom XV in the 60’s.
Guitar News / Re: Famous guitarists who play solid state amps
« Last post by Dino Boreanaz on January 19, 2022, 10:07:11 PM »
I think Billy Gibbons also used the Marshall Lead 12 to record My Head's In Mississippi.
Guitar News / Famous guitarists who play solid state amps
« Last post by joecool85 on January 19, 2022, 04:03:10 PM »
Guitar.com did a great article about famous guitarists who play solid state amps.  It seems everybody knows about people like BB King playing a Lab 5, or Kirk Hammett using a Roland JC-120 for his clean sound on a few tracks.  Some interesting ones though are the users of the Marshall MG series amps (Wayne Static) and *Marshall Valvestate (Billy Gibbons). 

So, who are your favorite artists using solid state amps?

* To be clear, the Valvestate does have a tube in the preamp, so it isn't completely solid state.

Amplifier Discussion / Re: Want to fix my Traynor Bass Mate 25
« Last post by Bubba T on January 19, 2022, 01:51:21 PM »
 Hello fellow members of SSG . I would just like to thank everyone who responded to my post about upgrading or fixing my Traynor Bass Mate 25 . Well , I'm very pleased and happy to let everyone know that I read most of all the helpful suggestions . (as there where a lot of responses )  I bought the Fender Rumble LT25 , and I'm really diggin it . Thank you one and all .
Honestly, the best way to make small speakers sound good is to remove the bass frequencies until they stop "farting" when you play.

Past that, choose a small speaker with the best frequency range - at least 100hz to 5,000hz.  Normally high end is fine, you can focus on the low number.  If much higher than 100, it just won't have any bottom end at all.

Next you need to pay close attention to SPL.  The SPL rating will be dbm/w meaning that it is the volume of the speaker using 1w of power at 1 meter distance.  The higher the rating, the louder it will be with the same power versus another speaker.  Many cheap small speakers have SPL ratings of 75-80dB.  I recommend at least 90dB.  Comparing an 80dB speaker with a 90dB speaker at 1w, the 90dB will be exactly twice as loud!

Here is the best small speaker I've found so far: https://www.parts-express.com/Visaton-R10S-4-Full-Range-Speaker-8-Ohm-292-596

I sell this with the Honey amp kits.  It is "ok" sounding, but about the best I've heard from small inexpensive speakers.  Like mentioned above, to make any speaker sound "right" means paying attention to the enclosure.  Open air most speakers sound terrible - even large ones.

For reference, most 10" and 12" guitar speakers have ranges around 80-85hz to 5,000hz or so and SPL ratings between 93dB and 101dB.
The only tiny speakers I have ever noticed decent sound from are in soundbars or computer speakers, a very few of these sound ok, sort of.
They are meant to be small with big sound, but I imagine they might sound crap if you take them out of the housing they are in.
If you find some cheap at a tip shop or second hand shop it might be worth a try.
I have a small sound bar on my computer which can get fairly loud, the speakers are very small in it, I'm sure I could drive it straight from a preamp pedal.
I have a Sunn Beta Lead pedal I might try it with one day.
The great thing about DIY practice amps that run off 9V power is that there are so many to choose from! (The other great things are that they're inexpensive and usually fun and easy to build, of course.)

Off the top of my head:
  • The aforementioned Honey, of course, which I had a blast building. (and I'd definitely be interested in a Honey II with a different IC!)
  • The Noisy Cricket Cabell mentioned.
  • I got started with runoffgroove.com's Ruby, and their Little Gem mkI and mkII are also worth a look. They have some mod suggestions for their designs, as well.
  • Bruce Zinky's Smokey is as simple as it gets, it even omits the Boucherot cell from the LM386 datasheet's "minimal" schematic. (The Noisy Cricket page I linked also shows a couple of simple Smokey mods.)
  • At the other end of the spectrum, Electrosmash's 1wamp crams in all kinds of features. Looks like kits/PCBs aren't currently available, but full schematics, KiCad files, etc., are hosted on their forum.
If looking for a small 9v practice style amp, you could always try SSGuitar's own Honey Amp: https://store.ssguitar.com/product/honey-amp-kit/

Schematic and other info are in the Honey Amp section of the forum here: https://www.ssguitar.com/index.php?board=21.0

I'm looking at doing another version of this and rather than using the LM386, use a much cleaner and quieter PAM8302A.  Not sure how much interest there is for this though, so it's still in the beginning stages.  The upside is that it would yield about 2.5w of power and run on a single 3.7v lipo battery with very high efficiency.
Schematics and Layouts / Re: Randall Century 100 schematics?
« Last post by phatt on January 17, 2022, 08:38:36 PM »
Great to hear you have resolved the issue, I know how hard it is to understand the intricacies of these things when you are new to it all. :dbtu: :dbtu:
And YES leave the Mains Earth wire connected to the Chassis, It's always the first thing I check when working on gear.
Keep at it, the next time you have a bad hum you will know what to look for :tu:
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