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I've had some of these in a drawer for about a year and not really thought much of it.
Until I realised I could build a 100W (aside) stereo HiFi with full range 4Ohm Loads and putting a cab sim etc through it.
Problem is, it sounds very lacklustre in its overall characteristics no matter the tone shaping... But they're cheap as chips.
Has anyone used these with good results or any documentation around?
Hello. I've been lurking here for quite a while but now have I have a proper question.
I own a Super Reverb. I'm interested in trying out the type of setup that Phatt is an advocate of which is using a tube amp into a 30-ish ohm load resistor and then into a power amp, then speakers.
The LOAD R needs to be about 3 to 4 times the speaker Impeadance otherwise it's going to be very lifeless. 8 Ohm Loads on 8 Ohm tap will just turn your favorite tube amp into a limiter (a valve version of a...
Small convenient practice tool that clips onto a belt. Plug an instrument or pedal board into one end and headphones into the other end. Powered by a 9v battery fit into a 1590A size enclosure.
Hey there! I bought this Peavey Express 112 to leave it at my music school as a students amplifier, it cost me 35eu, so nice deal there, the clean seems to sound mostly good. I cleaned all the pots and reverb connectors and now reverb sounds good, also the seller told me the amplifier wouldn't switch to drive channel, and yes it doesn't, with the tester the switch seems fine. I found that there is a resistor burnt, R101 is completely fried, so i removed it but I don't have a replacement yet,...
Based on conversations I've been having lately with Modman, I decided to pick up an upmarket load box to see what that's all about. I had experimented with the concept a bit way back when I worked for Weber and was making attenuators all day. Lots of people (at least in the TGP scene) think this Suhr one is the hot stuff (or was the hot stuff a few years ago :lol:), so I nabbed one. Inside isn't a surprise: resistors, caps and a couple inductors. Usual things for a reactive load. Anyone...
This is the new standard in quality bass amplification. The thunderfunk 750-A is based off of the origional AMP BH420 , Gibson GB440 amplifiers from the 80's and 90's. In fact, if you look at the amplifier board, it is IDENTICAL to Gibsons' Gb440, and later EDEN bass amplifiers. Since they use the same Sanken 2SC3264 and 2SA1295 Output transistors. Earlier models used the 2SC3858 and its counterpart.
The pictures in this first batch are dumbed down a little much. I can never tell...
So I am currently listing my Orange Rockerverb 100 MKII + ppc212 for 1650€ and I have been recently offered a trade with an Hiwatt dr103 reissue from 2009 + fane 4x12 cab. I would have to add 700€ on top
What you think about it? Would you go for it or pass? I am bit puzzled
The rockerverb clean channel to me is meh, right now I am not using the dirt channel at all and I am bypassing the preamp by plugging a fender valve preamp in the return
Can anybody help me out
What is this brown thing covering the resistors? Could it be on purpose when assembling the amp or are the resistors starting to fail?
I've mesured them from the bottom of the board and they are ok, on the top of the board i don't get any readings.
I'm looking at these because my bogner alchemist is changing channels on it's own.
I've looked at a schematic and noticed that these resistors are in the path that gives 3.3v, witch is the voltage for the...
I've been itching to design and make a new circuit board. This one is the combined take on the infamous ruby amp with switchable bassman / hiwatt controls. There's also a headphone out, but the wiring isn't depicted as it's all off-board.
I'm not really into buying more stuff, but couldn't let this one go. It's the 1960-4 Carad R53PA, a tube tape recorder using EF86, ECC81 (x2), EL84 and an EM84 indicator tube. It has built in speakers but simple standard jacks for input and external speakers. I haven't hacked into it yet, the video below is a quick tour around the thing. Would look great just sitting on a speaker cabinet, with the red pilot light and the green indicator blinking away...
I've been messing about with a 5 watt el84 based power amp, but with only an output transformer.
I've seen all sorts on youtube were people have made them with el34 and 6L6's, all using the same power supply, which can be seen on the far left, below
I've tried to hook mine up as per schematic (below) but no go.
I get sound for about 10 seconds if I use an RC network, but the voltage drops and the cathode resistor gets hot (150R).
I'm glad to post here a big piece of my work... I've made a new main PCB for my Laney LC15R (the stock one had issues because of my bad soldering abilities at the time I decided to change the plastic power tube sockets who had burnt to a toffee-like color for ceramic ones)...
I have torn the amp to pieces and I have scanned the PCB. Then, on this full exact scale, using Inkscape, I drawn the new PCB, creating new places for through hole components instead of SMDs...
Hi folks
Every now and then, one has an eureka moment that one feels like sharing, but sometimes the fear of being severely flamed forces one to keep it to oneself.
After servicing tube guitar amplifiers for close on 40 years, I have decided to share a very simple component change that I discovered a few years back, because in my humble opinion, it makes a very large tonal difference, but first, some background :wink:
Have you ever wondered why those British tube amplifiers from the 60s sound...
I'm currently in the process of working on a diy Sloclone 50 Tube amp build, it is basically a 50W Soldano SLO, but, I'm planning on using a pair of matched JJ KT77 power tubes instead of 5881 tubes as used in the original SLO 100, I've never tried KT77 tubes before, apparently from what I've read online, they are like a cross between the EL34 and the 6L6, and are supposed to be a drop-in replacement for the EL34, a mate of mine said that KT77 tubes should be a nice choice for...
Old but gold!! I keep seeing a these everywhere! I also have a small batch arriving at some point this week! Searched this forum for circuits but not a lot comes up.
I built the tube version of the ODS (which I probably should share at some point if anyone's interested)?!!
It sounds great with most power amps, but I want to build a dedicated power amp (SS) and build a cab etc for home use.
Does anyone have or know of a circuit that would sound good for home use?
Since I have the Bandit 112 I Wanted to do something about the attenuation.
The amp starts breaking up (transtube) at Vol 6-7 at 25% of power level but still, too loud for home use.
I have the 2-silver stripes version:
I found on a post from 2020 a guy saying he added a master volume after the T dynamics circuit and said: it is a 47k / 50k pot in series with the feedback tail. At 50k and T dynamics at 10% one now has 0.65 crancked Watts
He also added this Schematic (red...
It looks like a cheap 80's transistor amp, but it's in fact a little tube monster with its 12 speaker, 6L6GC single ended output stage and a real spring reverb.
Fender Champ 12 front.jpg
No digital shit built in, too early for that. PCB based, but tube sockets are on the chassis, and the power section is separated on power board.
It pretends to have 2 channels, but doesn't really - the distortion is 100% tube based. It uses LDR switching to switch in and out part of the circuit....
So I don't know much about class D amplifiers but I have this in for repair and thought I would take some shots. Unit was dropped from about 4 feet and looks like it landed on the gain pot which I will replace. Can't see anything mechanically wrong with either board but will probably reflow all of the heavier components just to be safe. If anybody has any ideas as to what it could be, I'm all ears.... I'll add pics of the bottom of the power supply/amp PCB later on this evening.
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