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    As generic as it gets. Back in those times there...

    As generic as it gets. Back in those times there was a cab builder in Queens or nearby Long Island by the name of Wachuwan - like "What you want?" in New Yorkese. Sam Ash carried a couple of their...
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    The sweet sound of success! Did you find a...

    The sweet sound of success! Did you find a rewind? Let us know, in case anyone else in that area runs into the same problem, they can find the info by searching.
  3. One problem I've found common to all old...

    One problem I've found common to all old Marantz's - electrolytic caps gone bad. Very much including the smaller ones scattered all over the boards. So bad some of them, goop leaked out and totally...
  4. Late 60's - early 70's Ampegs often used a type...

    Late 60's - early 70's Ampegs often used a type of cap that was housed inside a ceramic cylinder. In recent years (1990's onward) I've seen them fail short, often blowing a coil of metallic capacitor...
  5. A couple things. First, AC power - the voltage at...

    A couple things. First, AC power - the voltage at wall sockets is typically higher than it was 50+ years ago when this amp was made. Back then, 117V give or take a couple. It's common to find 125V...
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    Yes it does look thoroughly rebuilt. And whoever...

    Yes it does look thoroughly rebuilt. And whoever did it may have found a chassis here, and a box there. No matter, if it's working well that's what counts.
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    470 . . . You could do that, at the risk of...

    470 . . . You could do that, at the risk of having such a low bias current that you'll have severe crossover distortion. If it's for guitar, and you like a gritty sound that never cleans up then go...
  8. Sure looks good, rock bottom price, FREE SHIPPING...

    Sure looks good, rock bottom price, FREE SHIPPING - from China. Geeze how are we gonna support US manufacturing when they undercut us like this? Oh well, that's the way the fortune cookie bounces....
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    Nice find, and good work troubleshooting....

    Nice find, and good work troubleshooting. Bandmaster and Showman were built in the same chassis, same size box. That's why there are two extra holes for output tubes in your Bandmaster. Wrong tag...
  10. Not quite. While it's true that Shuguang is the...

    Not quite. While it's true that Shuguang is the source for - possibly - all the TAD tubes, there are some TAD's that are obviously "STR" that is specially made for them. One I've noticed is a type of...
  11. . With Ampeg, it sorta ran hot & cold for me....

    .
    With Ampeg, it sorta ran hot & cold for me. Late 90's I asked for an SVT-CL schematic. They sent me a big manila envelope crammed with big blueprints. Very hard to follow as multipin connectors...
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    It has the patina of age, and the finish worn out...

    It has the patina of age, and the finish worn out in spots by actual use. Nothing wrong with that! Fender sells "relic" guitars with factory applied wear spots & blemishes, charges plenty extra for...
  13. You can select which pickups are affected by tone...

    You can select which pickups are affected by tone controls by arranging bridges - short jumper wires - on the selector switch.
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    There are "scrambler" adapters that let you sub...

    There are "scrambler" adapters that let you sub 6U8 or 6GH8A for 7199. I've used a couple, they work fine. Have to make sure there's enough room inside a chassis to allow for the extra height - only...
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    I think the verdict is in: open coils on mid &...

    I think the verdict is in: open coils on mid & neck. You can choose to have them rewound. Or buy new - or used. 78-79 isn't in the time span where folks practically worship the pickups. If it was my...
  16. Something else to consider: if the preamp tubes...

    Something else to consider: if the preamp tubes that were in the Laney were good, why not leave them in place. One less major factor in trying to recreate the tone with a fresh set of outputs. When...
  17. Did you set bias properly for the new output...

    Did you set bias properly for the new output tubes you tried? Even if you manage to score a set of $$$$ real (not currently made fake Russian) Mullards, bias must be measured and set appropriately.
    ...
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    It looks like the pickguard will have to come off...

    It looks like the pickguard will have to come off for a closer look. It's time to think about finding a guitar tech you can trust, and maybe even watch if he'll permit it. Personally I'd have no...
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    Good advice there. You can get a good idea what...

    Good advice there. You can get a good idea what the pickup resistances are without having to take the guitar apart. Dial volume full up. Plug a guitar cable into the jack, with an ohm meter measure...
  20. Wow, that's kind of a wide range of Hfe isn't it?...

    Wow, that's kind of a wide range of Hfe isn't it? I'd expect the ones with higher Hfe to be turning on whilst the lower ones sorta remain asleep. Where's our crew of solid state experts? Hope they'll...
  21. Then we're onto the rest of the power amp. There...

    Then we're onto the rest of the power amp. There are some quirks in that circuit, for now I'll have to leave it to those better equipped with solid state knowledge to point out what may be amiss....
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    Fender's been asking some princely sums for...

    Fender's been asking some princely sums for certain replacement parts lately. So I discovered when I needed to replace the mid pot on a Blues Junior. $6.95 for a super cheezy made-in-China pot that...
  23. That output DC blocking cap may have lost its...

    That output DC blocking cap may have lost its microfarads. Had one do that a couple years ago in an Acoustic 370. Easy test, simply parallel the one you have there with 1000 + uF cap, it doesn't have...
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    Some 25ish years ago when I became aware of...

    Some 25ish years ago when I became aware of (Buzzy) Feiten compensated tuning, not only was the nut altered, but the bridge position was too. Apparently compensating at the nut only is not enough,...
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    That's why I think it's not an acceptable...

    That's why I think it's not an acceptable engineering solution. But it would certainly shorten the "warm up" time to a fraction of a second. For those who just cannot wait. People are so...
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    True that - sometimes I've put a surge thermistor...

    True that - sometimes I've put a surge thermistor aka inrush limiter in the AC line - note several manufacturers like Peavey and Fender have done the same. Even the high quality hi fi / industrial...
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    So a 5W resistor leaves plenty of power headroom,...

    So a 5W resistor leaves plenty of power headroom, not much chance it would ever burn out.

    Note the most recent drawing shows a 10 ohm resistor. If that value is used, and somebody plays the amp in...
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    I like the latest iteration, but use a 1K or 470...

    I like the latest iteration, but use a 1K or 470 R instead of 10 ohms. SO WHAT 20 seconds, or 10, if the amp user is so impatient they can't wait less than half a minute let 'em suffer the thump....
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