Tube Amp Archive

It also appears to me that the grid stoppers are already positioned very nicely so should I connect lug 2 of the dual gang to somewhere on the board to take advantage of the existing stopper? Thanks for any help someone can offer. Here is the pic I am looking at... https://www.zikinf.com/_gfx/matos/...

I like the ppimv in my fender supersonic and 1987x so much that I am going to attempt to install one in my artisan 15 and eventually artisan 100. The thing that has me puzzled is that the 15 splits 220k and 200k to ground. The class a switch appears to switch in a 2m2 resistor in series with the 220...

Got it! The wiper on the high volume pot was broken. I wasn't even working over there. Still have some hum on the high volume when it gets above 8. I noticed that the bright cap is missing from the volume pot and there is a resister in series from the wiper to the board (not sure of the value). I th...

Ok, This does appear to be a 1987x. I have followed the schematic and checked all the points on the board to v1a and the bright inputs to the board for continuity. All checks out using this http://taweber.powweb.com/store/6m45p_schem.jpg I have read about loose pins but I am still unclear on tighten...

http://valvestorm.com/Products If you get the amp wiring bundle, you will have enough for two or three amps, maybe more depending on how neat you are with the wiring. You might want to get some extra black wire--that always seems to run out first. We're used to it in Minnesota. It does slow down th...

Back to the stripping wire part of the thread. I used to have a lot of trouble with smaller gauge wires breaking right at the board connection (mostly in effects pedals). I got a thermal stripper and the problem vanished. Almost as good an investment as a good soldering station. Thanks! Any recomme...

Now I've done it. I have gone through the amp and cannot figure out why the bright channel is not working. Could it be tube related? What do you mean by "I have gone all through the amp..."? Have you tried changing tubes? They certainly can - and do - go bad. You could also have issues with the soc...

Part of my trouble is that I do not think this amp is exactly a 1987x when compared to the layouts I have seen. Since I am a newbie I do not know which direction to turn without a schematic or layout. The normal channel is great. I have checked the leads to and from the board and the leads on the in...

Now I've done it. I have gone through the amp and cannot figure out why the bright channel is not working. Could it be tube related?

95% of the hum is gone. I must have clipped something in the bright channel cuz I am only getting faint signal. The normal channel is great!!!

The amp has a persistent hum the interferes with playing. I have just finished pulling enough wire (that was surrounding the heaters) to make another amp. The output lead from the impedance switch was also running parallel to the heaters. Here are the after pics. Cross your fingers for me. I can see...

Here are my pics (aka before shots). Now the amp works so I am debating with myself regarding surgery or a splint... I am still new at this amp stuff so if you guys see something I would greatly appreciate some advice! Hope all is well in Minnesota... I did the three way tone stack switch and ppimv.

In the past I have cut extra length then pulled the insulation back by hand and clipped off the extra for insulating component leads. I suppose I could always push the remaining insulation back on leaving the necessary room for solder and no risk of nicks...

I have been using 22 and 24 awg solid on my pedals since 2006. They take WAY more abuse than my amps and not only have they not failed but when I open them up all the right angles are still there. Regular ole lowes wire strippers. After this thread I am going to be nervous about nicks :? If you aske...

I should have mentioned that this is a relatively modern replica. I ruled out the filter caps for that reason. If this guy was original I wouldn't have put a ppimv in it. The leads coming from v1 and v2 are wayyyy toooo looong. I will take a pick tm. Hmmm, topcoat. Any suggestions on where to pick s...