LedZepp007 wrote:Thanks for all the info everyone!
I will say this: I have really not enjoyed working with the eyelet board. In some cases it's taken multiple attempts to get a seemingly solid connection. Hopefully this thing works when I'm done with my modifications. If not, I may have more questions
That being said, I have had a lot of fun working on it, which is a good sign.
I will NOT be using eyelets when I build amps for myself.
I've worked on them for years, never a problem. I use a cheap Weller wlc100, 40 watt, usually not at full power.
I put some soldier from the spool on the tip first, each time i solder, it will heat up faster. Is your tip clean, i use a wet sponge and before each solder clean the tip.
Go to the Triode electronics site and look at the layout for there ppimv kit and what I would do first is wire it up with just resistors and see if you like sound of just full on preamp distortion at low volume because I for one can not stand it, the fact of the matter is you already have 2 watt single ended amp that can drive 8 ohm speaker right now sitting in front of you!
If you do not mind having no reverb from the amp at low volumes than just plug a 8 ohm speaker into the rca send / drive Jack of the reverb circuit and there Ya go, a 2 watt low volume amp!!
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Well, not surprisingly I've screwed something up. I cut out the MV for now and decided to re-bias and try the guitar through it. There is no sound out of either channel. I get 500ish volts on pin 3 of the power tubes. Smelled something burning (briefly) unplugged and (with my bias board) waited for voltages to come down. Unfortunately (as it turns out) pin 8 of each of the 6L6's were poorly grounded (I had to solder 1 ohm resistors in a tight spot to ancient solder) and so actually picked up some voltage after i turned the amp off. Naturally, I got shocked by about 15 volts. This makes me look like a huge newb (which I am). Attached is what I have in the circuit now. I wouldn't force my worst enemy to look through the whole thing, but if anyone sees anything that obviously wrong, I'd love some help. Also, I was VERY careful with the electrical hazard that is an open amp. Which makes it even more embarrassing that I got shocked.
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You can not just cut out the amps master volume and have it still work as a jumper wire needs to be put in place, also I dought you got shocked by only 15 as that very hard to feel, just like testing a 9 volt battery on your tung, you fell it there, but at no other place on your body!
With a poor cathode ground those output tubes where red plating and that is what you smelled getting hot, now those output tubes that did that may be gonners, you will find out if the amp starts to blow fuses!
If you do not have 4 solid cathode grounds and a - 52 ( for starters) volts on each output tubes pin 5 when in standby, then do not take the amp off standby until you fix it!
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Again, thanks for all the info. I worked a bit more last night on the amp. Looks like some of the solder joints probably need work. The solder I was using was definitely lead free, but I got some new, thicker, solder that is working a bit better. For some reason, getting good solder connections in this amp has been much more challenging than when I built the Airbrake last week.
My voltages are off. Pin 3 of any power tube is still at about 500V when standby is off. The 220k junction has been lurking around -75mv. Pin 4 was at approximately -1 V. I'm going to triple check my connections and work, but does anyone have a suspect in mind for these voltages?
If you mean with the amp powered up then you have pretty much 500 volts on pin 4 of each output tube just like you do on pin 3?
That high voltage is due to the output tubes not conducting, what is the negative voltage you have on pin 5 of each output tube, this should be the same voltage with the amp in standby or not!
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
I'm late to this party and maybe I'm not seeing it correctly. Pictures can be funny that way. There is a shielded cable running next to what I guess are the PI resistors (22K, 1M, 470, 1M). It looks to me like there is a whisker jumping over to the shield. If it is as I think, I'd suck all the solder off that joint at the eyelet and redo it. Maybe it's nothing, and maybe nothing to do with the problem. I don't know.
