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Hoffman Amplifiers > Amp Stuff > AmpTools/Tech Tips (Moderators: Geezer, tubenit, PRR, sluckey) > Alamo Embassy (2563) Amp Schematic ??
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LooseChange
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« on: March 11, 2012, 07:18:49 am »
Small amp with a 5Y3, 6V6, 12AX7 and a 6AV6 (tremolo).
Volume, Tone, Speed and intensity.
10" Speaker.

Thanks!
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« Reply #1 on: March 12, 2012, 07:11:38 pm »
Somehow I put this in the wrong place.
Still can't find a schematic. Anyone?
Thanks!
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« Reply #2 on: March 12, 2012, 07:14:42 pm »
I think Alamo schemos are had to come by.

                   Brad      icon_biggrin
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John
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« Reply #3 on: March 12, 2012, 09:02:12 pm »
LC, I googled last night for a bit, couldn't find nuthin but guys talking about their Alamo and not being able to find a schem. Sorry!
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« Reply #4 on: March 12, 2012, 09:15:33 pm »
Thanks for looking.
It's a small enough amp that I was able to troubleshoot without issue.
The amp is working really well now.
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« Reply #5 on: March 12, 2012, 09:16:01 pm »
I've got like four here, but none for the Embassy. (Capri (2360), Fiesta (1962), Jet (2564), and Montclair)
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« Reply #6 on: March 12, 2012, 09:31:19 pm »
Any of those amps run the tremolo with a 6au6? I'd like to see that.
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« Reply #7 on: March 13, 2012, 07:06:04 am »
Quote from: LooseChange on March 12, 2012, 09:31:19 pm
Any of those amps run the tremolo with a 6au6? I'd like to see that.


this one runs 6Au6 for trem osc...

good luck with you're quest.

--DL
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« Reply #8 on: March 13, 2012, 03:09:20 pm »
Quote from: LooseChange on March 12, 2012, 09:31:19 pm
Any of those amps run the tremolo with a 6au6? I'd like to see that.

Lessee....

Capri... No... 12AU6 input, 50C5 output, 35W4 recto... like a cheap Kay or bargain basement, but has a tranny that isolates it from the mains (and a tap on the secondary HT to run the series heaters)
Fiesta... No... 12AU6 input, 50L6 cathode biased output, 3525? recto... 12AV6 trem... (wiggles 50L6 g1)
Jet... No... 1/2 - 12AX7 input, 6V6 output,  5Y4GT recto... SS reverb, other half 12AX7 & SS trem.
Montclair... No... 12AX7 input split for 2 ch, 12AX7 in a cascode config? on second channel, 7199 PI, 2-6V6PP output... 12AX7 trem on second channel.

<Attached: Montclair schemo that I have... I think there's errors in it too>
* alamo_montclair.pdf (16.87 KB - downloaded 50 times.)
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« Reply #9 on: March 13, 2012, 10:29:09 pm »
> Montclair... 12AX7 in a cascode config?

No. Both units shorted grid-plate: diodes. Also note DC voltages near zero.

Diode modulator. Trem signal is applied out of phase, no thump, but diodes cut-off and block signal.

Possibly an evasion of Fender's patent. Or "good idea" for thumpless low-level modulation. Must say I've never seen it before.
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« Reply #10 on: March 14, 2012, 12:58:55 am »
Quote from: PRR on March 13, 2012, 10:29:09 pm
> Montclair... 12AX7 in a cascode config?
Must say I've never seen it before.

OK, so please tell us more? Maybe a good thing to add to all us trem guys?


            Brad         think
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