Maybe this is a dumb idea,
But since this is for your amp,why not ditch the V-I limiters and just use a thermal shutdown device?
If your amp starts shutting down find the problem and fix it-probably right back to what RG said...
Overbuild it.Then it doesnt shut down anymore.And you still have some protection against fire from short.

Hi Joe really cool.
Are those all Radio Shack components?
That would make this really easy for anyone to build.

Well 50 watts minus loss to heat and rectification,compared to how many watts do you expect from the bridged chips?
I think those chips run at about 60% efficiancy?
So the TDA2005 likes up to 18V 3.5 amp supply so yours would be good for one chip.

Also the TDA2005 is already a dual amp package you can bridge one chip using both of the internal amps,but IDK if you could bridge 2 chips using all for channels.
Also there are different versions (M,S) so check which you have.
Maybe a parallel PP BTL setup? IDK if that would work or be benificial.
JM Fahey is really the expert on those chips,He can probly offer more info here.

  :trouble

I agree the Hurricane was my pick.
I still havent had time to work on mine,and didnt enter it because it wasnt (and isnt)finished.
Congrats Armstrong :tu:

Is that why my big Crates have those .01 strapped across the mains before hitting the primaries?
To help prevent POP?

I think they are all really cool. :tu:

Yeah re-amping the "Ruby" or 386 is a good starting point.
I cant say its the best because its not,but if you like the clipping characteristics of the 386 chip(like I do).Then its good and simple.

Oh yeah Joe its going through the 386 in all of those clips.
I need to re-record the clean clips to show the difference lowering the 330n in the op-amps feedback loop makes.
I like 120n+167n added in on the clean channel (287n total)
At this point I would say breadboard this for yourself and try it,
I think I have nailed "tube breakup" really well.

I also need to recalculate the filters to provide some real numbers.
But it does sound really good now.

Thanks Joe I am glad you like it  :tu:
Here is a much better revised version of the pre amp. http://i419.photobucket.com/albums/pp276/Bry928/SolidState%20Amps/12Watt-TDA1519B%20build/386PreAmp_2.jpg
The key to a full yet clean tone lies in the cap on the bass boost switch,
Alternately a two way switch could be used for 3 different settings adding to the 120n
Which sets the knee pretty high around 700-800 hz (with 100n) if I remember right.
Using two 120n caps works well to clean up the flabby bottom end,only requiring a little
more on the volume knob to get the same "breakup" from the 386.
While a 220-330n requires backing off the guitars volume and/or easing up on pick attack to keep from getting flabby sounding.

I also recommend adding the standby switch as in the TDA1519B data sheet.

Also a 2 pole 6 position switch could be added to the OD channels feedback loop for 6 different diode clipping combinations- add some hard clipping diodes to the output on a switch and you have 14 different diode clipping sounds as well as the infinite EQ and gain options.
Another thing is the tone control a full Treble Middle Bass tone stack would allow even more tonal control.
I am very pleased so far- now to finish the power supply and figure out how to make a charging circuit.

Radio Shack is gonna wonder why they are selling so many of those trannys soon  :tu:
Again excellent Joe- I imagine alot people will try this one.

You are absolutly correct JM,
I should also note I was using 12 AA Nimh for PA and a 9V for pre amp.
and thank you for the kind words.

OK the usual disclaimer -spinal injuries few years back(for real)carpel tunnel,bad arthritis
and I cant play. :tu: :lmao:    EDIT   Oh yeah and the clips sound worse off that server if anyone wants the original MP3s PM me
But the clips will give you a fair idea of the tone and what I mean by tube emulating.
http://vibecat.com/brymus

Recording technique- one channel is pencil condensor at spkr off axis,other channel is large diaphram condensor 3-4 feet out.
Cab 2X12  1XJensen Elec Lightning and 1XCrate Custom
Guitar Jackson Warrior Elite-Duncan humbuckers hot bridge(OD clips) jazz neck (clean channel clips)
Into Tascam US144-Mixcraft(cheap program)
NO EFFECTS OR COMPRESION the reverb is the room itself these tracks arent even EQ'd
All tracks tone control set in middle the master is at less than 30% except the first track Where both master and volume at 50%
Track1 Clean Channel-gain on 386 at minimum Fink Ployd
Track2 Clean Channel-gain on 386 at 30% Long cool Dress
Track3 Clean Channel-gain on 386 at 80-90%(max) SRV WannaBe
Tracks 1-3 channel gain at 30%
Track4 OD Channel-gain on 386 at minimum Tenacious B
Track5 OD Channel-gain on 386 at 40-50% MegaBrymus-1519Magix
Track6 OD Channel-gain on 386 at 80-90%(max) I'm not Jimi
Tracks 4-6 channel gain at max and volume at 80% master 30%

I revised the schematic. I will post it tommorow .It sounds right now.It could be adjusted for an even cleaner sound by lowering the value of one cap,I like it the way it is now.
I will post the revised schematic as well as suggested mods (clipping,EQ)and it should have the standby switch to prevent spkr pop(not bad really).
Anyone know a better MP3 hosting site?

Cool -are those hand made knobs?
If so how?

I dont own one but I like the way Marshall had some cabs set up with a selector
So you could have a stereo cab at one impedence or a mono cab at two others all with a twist of a knob.