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  1. No worries Justin, it took me a long time to "get...

    No worries Justin, it took me a long time to "get it" too. Another one of the amazing things you can do with vacuum tubes. :D
  2. Indeed - check the inverter stage design for an...

    Indeed - check the inverter stage design for an example. In this circuit, the signal is deliberately transferred from the first triode's cathode to the second triode's cathode simply by connecting...
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    What I've found in disc caps, especially the...

    What I've found in disc caps, especially the larger ones (say 8mm diameter or more) - some have a mechanical resonance (mictophonic effect) that has little to do with their filtering function. Tap...
  4. Let's have a look at the insides - see if it's...

    Let's have a look at the insides - see if it's one of those phony "Fender" amps marketed in the Far East during the VietNam era. FWIW a customer bought one such amp a few years back. It was about the...
  5. I'd have to conclude the front panel isn't...

    I'd have to conclude the front panel isn't original, it must either be a duplicate of the "electric" era panel. Or was swiped from a Deluxe Reverb of that period, maybe a "parts car". Also, I've...
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    Make sure you clean off all the debris you said...

    Make sure you clean off all the debris you said you found, both on the screen & speaker magnet - so your glue will stick properly.
  7. Nevets you should copy those photos & list of...

    Nevets you should copy those photos & list of items to MEF's Flea Market.

    Also - permit me to commiserate. I've always been awestruck by your collection of test gear. Not only the items, but that...
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    Geeze, I wouldn't suggest that, even without...

    Geeze, I wouldn't suggest that, even without filthy dog germs present everywhere!

    Bad caps can emulate all the noises you'd think a bad tube can make - squeeks, pops, outer-space noises - just...
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    With a large value resistor standing in the way,...

    With a large value resistor standing in the way, in the plate circuit, probably won't wreck most preamp tubes. Nonetheless, they're best operated where they expect to be.
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    True 'nuff & let's also consider stages where...

    True 'nuff & let's also consider stages where there is no tone stack - output tube grid drives, input to splitter/inverter, reverb mix, etc. NONE of them like to be misbiased. So - stop the leakers &...
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    Good of you to mention comparing bass cab...

    Good of you to mention comparing bass cab sensitivities - it's possible they may differ radically. And - are all the speakers working?

    6146 now a bit rare. Time was, they were common as dirt. A...
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    Not just volume pot tolerance - one might be...

    Not just volume pot tolerance - one might be linear taper, the other log taper. That alone could account for a large disparity between loudness & volume pot settings.

    Also - in years when 12DW7...
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    I like this theory best. Hot air rising from the...

    I like this theory best. Hot air rising from the bank of output tubes could be baking the wood in the new cab's "ceiling" above the tubes. You might consider stapling a square of aluminum flashing...
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    It sure is. But if you want to sub in a film cap,...

    It sure is. But if you want to sub in a film cap, no problem. It's not under a lot of stress as a cathode bypass, what's it going to see maybe a volt or two. More than likely it's OK for the next 20...
  15. Reverse taper pots are rare enough as it is, but...

    Reverse taper pots are rare enough as it is, but you can find 3 Meg versions meant for Fender amps at a couple of places. Antique (tubesandmore.com) is one of them. You'll have to solder in short...
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    100 uF 100V is common, and as close as you'll...

    100 uF 100V is common, and as close as you'll find to the original these days. I keep a supply on hand. Who knows where Fender found those odd values back in the day. There's nothing magic about...
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    This right here: ANY old amp, a prime...

    This right here:



    ANY old amp, a prime trouble spot is filter caps. Bet you half a peach swapping in new ones will diminish your hum to acceptable levels.
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    Sticky: Doesn't have the usual poor syntax & badly...

    Doesn't have the usual poor syntax & badly spelled words that are the major clues - the phishers are improving their game.

    Smart move to check your account but NOT use any link in the email.
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    19 mA is primo - park the bias right there &...

    19 mA is primo - park the bias right there & worry no more.

    You may be hearing clipping distortion - not unusual on most Fenders with volume control on 3-4 and most any guitar played full volume...
  20. Yes, the reverb/dry mix circuit where dry signal...

    Yes, the reverb/dry mix circuit where dry signal is extracted from the second preamp stage through 3M3 paralleled with 10 pF, you'd have to expect a little hi frequency peaking there. You could...
  21. You have everything but the chassis, still you...

    You have everything but the chassis, still you might find one that fits your needs at Allen. If you do, ask. The worst that can happen is "no I won't sell you just a chassis." Given the thin market,...
  22. You might want to look at what's available at...

    You might want to look at what's available at Allen Amplification. Some of his amps are pretty close to what you're proposing to do. Maybe you'll find a chassis & box that will suit your project....
  23. I keep a stash of 1N4007 handy, they're perfectly...

    I keep a stash of 1N4007 handy, they're perfectly good replacements for lots of rectifiers, including jobs like this. Maybe way over rated in terms of voltage but so what. You may have to add a...
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    That is one beauty of a Telecaster! Is there some...

    That is one beauty of a Telecaster! Is there some kind of polka dot pattern on the control panel, or am I seeing a reflection of some sort of acoustic tile?

    I like the little flat spot where the...
  25. Thread: Nope!

    by Leo_Gnardo
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    I remember that - rarely did I get any phone time...

    I remember that - rarely did I get any phone time with Tom, but his salesman clued me on to this botch. I applaud their honesty. And remember - if it's too good a deal maybe there's a reason for it....
  26. Thread: Nope!

    by Leo_Gnardo
    Replies
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    730

    By coincidence, today's amp repair was another HR...

    By coincidence, today's amp repair was another HR Deluxe, also had its AC plug replaced. Checked with the ohm meter - what's this? Black & white were swapped according to the meter, and when I opened...
  27. Thread: Nope!

    by Leo_Gnardo
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    Aw, my cousin Melvin replaced that plug, he's a...

    Aw, my cousin Melvin replaced that plug, he's a perfeshn'l 'lectrish'n! Mel also threw out my 3 amp fuse, he said it was a girlie fuse. He put in a 30 amp fuse, and gave me a bag full more to replace...
  28. Vastly under rated! I've pitched in a couple of...

    Vastly under rated! I've pitched in a couple of reputation good mentions for you, and others should too. Hit that "sheriff's badge" link folks & let's get Helmholtz up to 25 or so where he belongs.
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