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Messages - bry melvin

#16
 I use Carvin SS amps for performing and recording.

They are great amps:

However IF you can't figure it out yourself almost no one fixes Carvin amps. Carvin has an exchange program. Currently the SX200 exchange is 200.

The Carvin SX200 blem on sale at Ebay from Carvin themselves for 269 might be a better deal as it comes with a Warranty.

If you are confident of your skills I'd go for it though.

Another thing is Carvin has been through several speaker suppliers. If it is an older 200SX with the speakers that were made by eminince it's worth the 100 bucks for the two speakers.

I use NEWER sx200s to perform....but I have sets of those old emminence made speakers that I use in them. They simply sound much nicer. I find the newer GT12 Carvin speakers have a woody hollow sound to them.
#17
you probably can:

this assumes the impedence matches:

however guitar speakers and PA speakers do NOT sound the same IT probably will sound pretty bland. Guitar speakers tend to distort in ways that favor guitar sound. PA speakers are essentially hi fi.

#18
few amps use mica+paste anymore. Mouser sells insulators for all types of transistor/ic packages that would replace the plastic type ones.

The one DON't on thermal paste is NEVER use some of the silver paste that computer fanboys are fond of. Most of these are actually electrically conductive and a real pain to clean off. I've fixed a few amps after someone has done THAT upgrade, literally having to scrub the circuit board and heat sink with solvents repeatedly.

Also sith SS amps no one is seiously concerned about keeping everything "original" in fact most of the transistors in older amps aren't even available in original form as everything is moving to lead free versions.
#19
There are two problem areas with using a digital reverb pedal if you don't have an effects loop.

1. If you have a true bypass you may end up with pops when switching depending on the pedal
2. bass notes and reverb don't get along in most good amps the reverb is forked off the preamp and lows filtered out prior to reverb then mixed back in with a dry signal... the low frequencies don't see the reverb

Pedals do work especially good ones. I recommend you look at the kits designed around the Belton digital reverb In fact this CAN be installed in the AMP at the beginning...this is done with the kits for the valve JR. However there is no significant difference between using this and it as a pedal.   look at this kit at
Quotehttp:://tubesandmore.com
.


Then you have the possibility of using a second small amp as the reverb. There are stand alone reverb units. KIts to make one from an EPI valve JR.  AND you can just add on a small amp with reverb using an ABY box. I do the latter with my old Marshalls. It works for small places. If you're in large places you don't NEED a reverb...in fact PAs often incorporate a DELAY so that the signall from the front and the signall at the rear of a big place arrive at listeners at the same time.

If you're recording digital reverb in the amp is pointless....you just add it in in the mixing...either with effects OR splitting a track and then moving one of the now two tracks a few milliseconds (or more) If you want to get the tinniness of a spring reverb...just filter out the lows for that new track.
#20
The Newcomer's Forum / Re: Fresh meat.
March 15, 2011, 09:53:50 AM
Quotevoltages established for TDA2040A
actaully thast was a faulty memory that was a crate amp i worked on  Fender uses +-22
#21
The Newcomer's Forum / Re: Fresh meat.
March 14, 2011, 08:07:54 PM
Might want to look at schematics for Fender frontman 15 amps and crate Gx30M....they both use TDA20x0 chips. Currently Fender used the TDA2050 but at voltages established for TDA2040A
#22
Quotehow do go about
testing out a circuit before you build it into a enclosure
My personal solution is an Epiphone  blues custom 24" steel chassis. it has 3 octal 5 9 pin holes and mout points for lots of pots and switches. is large enough to mount nearly any thing including breadboards in it AND put transformers outside. It also sets in a 10 by 8 by 36 "blank" plywood head cabinet that the chassis opening is lined with speed tape (heavey metal tape) for shielding.

I can build almost ANY AMP in that
#23
Never built a noisy cricket...but...I do a lot of guitar and amp work. Have you tried another pot for the tone.Those cheap pots are really easy to cook with soldering; after doing thousands of solder joints I still occasionally cook one if I'm not careful soldering in a crowded area. If that is what happened (check the pot) get a pair of hemostats or an alligator clip to use as a heat sink when soldering. Check the switch for continuity too if it's a small switch you could have cooked that too!
#24
Amplifier Discussion / Re: recycled car speaker
March 09, 2011, 04:13:13 PM
QuoteI like destruction.  One got demo'd with my brother's 1979 Ford E-350 Super Van...it's amazing what 5,000lbs will do to a speaker.

Never demolished a speaker intentionally.  Have had ALL my speakers self destruct at an outdoor performance thanks to a summer shower ....and the "show must go on" though

And I DID once demolish a garage roof with a 4 pound door handle  (it fell off my plane)
#25
Amplifier Discussion / Re: recycled car speaker
March 08, 2011, 05:37:04 PM
Here's pix of the frame I haven't done yet...and a guitar project occupying my table :D
#26
Amplifier Discussion / Re: recycled car speaker
March 08, 2011, 05:01:53 PM
coil frame is 1.2 "
coil .45 inch

the magnet frame top ridge that i centered the coil on was .2"
used inkjet printer card stock for coil installation shims fit snuggly

magnet on this one was about 4.5 inch diameter good (over maybe  size for 50 watt coil...think It has made up some for the wider gap

I'll try and take some pics as I do the other one...It'll be next week... Ash wednesday  Friday lenten services... ( I play classical guitar for my church) AND I've got my work benches tied up with acoustic guitars with glue drying for a few days ( bought a couple of Cordobas that had parts come unglued for a very good price! )

Speaker makes a big difference... I agree the original speaker is marginal...but it isn't JUST the speaker on the 25R I've seen "mods" online to take the bite off the treble doing it with a speaker change is much easier :D. I had been using the amp with an old sound city 2by 10 cab with old eminence alnicos...amp was so brite with my alnico single coil guitars I had to put the treble on 2 and crack the volume (no trebel bleed on the guitar) and roll the tone back 50% on the NECK  pickup...This speaker seems to have cured that problem.
#27
Amplifier Discussion / recycled car speaker
March 08, 2011, 11:54:29 AM
Just thought I'd share this recipe as it worked out very well to tame the treble on a Fender Frontman 25R I have!

I happened to have a pair of dead cheap chinese made car subwoofers around

I tore them apart with the idea of possible making a pair of bass 10s for the studio. On opening them up I found a 1.5 inch voice coil.

I used Weber VST parts 50 watt coil 10 ribbed cone and  1.5 ID spider. Cone and spider needed trimming spider was too tall. Cone comes untopped.

Not sure if these are going to work for bass studio use BUT I put one in the 25R this morning for testing and it REALLY smooths out the exessive highs these amps are know for...and total parts cost for the pair was about 30 USD.
#28
Amplifier Discussion / Re: matching a head with a cab
February 20, 2011, 11:58:36 AM
well that amp has two power amps . one for each channel. I agree though. As long as he's careful it will work.  I use two 60 watt cabs  often with a Crate G130cxl (like the fender stereo)head which is rated at 90 watts at 4ohms 65 at 8 ohms..(cabs are 4 ohms)...

BUT I play mostly clean or slightly dirty.

If he's going to do metal or use a lot of booster pedals etc he might run into problems...Clean or blues etc those speakers and cab will probably be just fine.

#29
Amplifier Discussion / Re: matching a head with a cab
February 19, 2011, 11:55:03 AM
no thats 120 watts total  sixty watts /side
#30
Amplifier Discussion / Re: matching a head with a cab
February 18, 2011, 02:27:15 PM
you need a stereo cabinet:  (or 2 2x12 cabs etc)  From fender manual:

"The Mustang V head amplifier provides stereo speaker
outputs that must both be connected to a stereo speaker
cabinet such as the Mustang V 412, with four 12" Celestion®
G12P Rocket 50 speakers (recommended), or two 8Ω speaker
cabinets capable of handling 75W each."


so you need TWO speaker setups or a stereo cabinet each half 75 watt.
Rocket celestions are 50 watt speakers...

so to be safe you would look at  :

two 75-100watt speakers
two 2X12 or stereo cab with a total of 4 50 Watt speakers etc

(next step down would be 30 watt speakers....not enough so you'd have to go to 50s)


The KUSTOM cab as far as I know is mono....so it would have to be modified.  Not your best solution.