If you go for a 2040, you can leave the original speaker in place, but, should you opt for a 2050, I strongly suggest to move to a better (and bigger) speaker (you'll need to put the soldering iron aside for a while and use a saw, a rasp plus some sandpaper instead). The added power changed the amp from a home/studio thing into a rehearsal/small gigs/club amp, not bad for an amp of this physical size (and weight). The improved bridge rectifier/filter cap section helped a lot with dynamics IMHO, as I noticed that, before modding the thing, while playing power chords at higher volumes the amp seemed to "squash" the sound somewhat.now the power chords are more "open" and the notes' attack seems no longer "squashed". The main improvement I had using different op-amps (5532s) was about noise reduction, while the sound was not affected. If you plan to use a TDA2050 instead, it calls for a +/- 25V supply, so you will need a 17.5-0-17.5 VAC (50VA) transformer (18-0-18 is still OK). If you move to a TDA2040, you need +/- 20 V, so a 14-0-14 VAC (40VA) transformer will be OK. The original output IC (TDA2030) calls for a +/- 18V supply, and therefore a 13-0-13 VAC (25/30VA) transformer is adequate. I used an Italian-made transformer, so I don't think its P/N could be of any use. PS did this do anything to the sound, or just amplify it?Hi Ryan, PS did this do anything to the sound, or just amplify it? It's sad for a 28 year old to have to call dad when a circuit keeps faulting lol.I also was wondering did the OP amps help smooth the "breakup" out, or just reduce some minor noise? thanks I'm kinda/ somewhat new to the Mod thing my dad has an electro/mechanical degree and helps alot if i get in trouble. I 'm gonna use the 2050 but was unsure about the appropriate Pt i know you suggest 50W any advice appreciated. I substituted the output chip - seems to me it was a TDA 2030 - with a TDA2040 and changed the original 8" speaker, putting in a 10" Celestion I salvaged from a wrecked Cambridge 30.ĭo you have a part # for the PT. I also added voltage regulators for the preamp section ( to avoid early clipping on the op-amps due to voltage drops when the amp is driven hard ). I replaced the original PT with a toroidal PT, with a slightly higher voltage and a better current rating, then I changed the rectifier to a 4 Amp bridge, this allowed me to increase the filter capacitors' value ( to improve the dynamic range ). I replaced the original op-amps with 5532s ( and it did help in lowering the noise, are you sure your 5532s are not crappy chinese fakes? ) and added DIP sockets for a quick replacement, but as a matter of fact I did the major mods on the PS and PA sections. I own a Pathfinder 15R, and I agree it's great value for the money, still, I couldn't keep myself from performing some mods.
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