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Post subject: Re: Let's build another Tweed Deluxe Amp!
Posted: Sun May 15, 2011 11:01 am
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Sounds like Tube Depot needs to ship the Deluxe transformers instead of the Deluxe Reverb transformers.

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Post subject: Re: Let's build another Tweed Deluxe Amp!
Posted: Sun May 15, 2011 2:45 pm
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rjake, yes I thought the voltages I was getting may have been because I was running off 240 volts at the wall here in Oz, but Ross' build confirms that even at 117v in the US the the voltages are higher. Pretty much confirms it is because of the Deluxe Reverb Transformer.

I still like the chunky Heyboer DR Transformer in the kit and along with the GZ34 Rectifier, it definitely gives the amp some extra punch and makes it somewhat more versatile for gigging with a band. I thought about swapping it but decided I liked the sound of the bigger Transformer compared to the '57 Deluxe in my local guitar shop (I took my amp into the store and it was auditioned by the very impressed store staff).

Ross, the Zeners will get the voltage down, the heat dissipation is shared amongst the smaller voltage 5watt Zeners, that is also why I left the leads nice and long. Try the same configuration as mine (4x15v and 2x12v), I think that will get you right in the ballpark. Make sure you get 5 watters and make sure the Cathode on each one (banded end) points to ground. Behind my little tag board I used a small Nylon isolation stand-off washer the same as the ones used to mount the amp's main circuit board.

Snowy


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Post subject: Re: Let's build another Tweed Deluxe Amp!
Posted: Sun May 15, 2011 4:26 pm
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No457 Snowy wrote:
rjake, yes I thought the voltages I was getting may have been because I was running off 240 volts at the wall here in Oz, but Ross' build confirms that even at 117v in the US the the voltages are higher. Pretty much confirms it is because of the Deluxe Reverb Transformer.

I still like the chunky Heyboer DR Transformer in the kit and along with the GZ34 Rectifier, it definitely gives the amp some extra punch and makes it somewhat more versatile for gigging with a band. I thought about swapping it but decided I liked the sound of the bigger Transformer compared to the '57 Deluxe in my local guitar shop (I took my amp into the store and it was auditioned by the very impressed store staff).

Snowy


I wonder if replacing the GZ34 with a 5U4GB would help?

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Post subject: Re: Let's build another Tweed Deluxe Amp!
Posted: Sun May 15, 2011 11:26 pm
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rjake wrote:

I wonder if replacing the GZ34 with a 5U4GB would help?


Thanks rjake, I'm not sure what would happen as I don't know enough about the different types of Rectifiers.

Cheers,

Snowy


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Post subject: Re: Let's build another Tweed Deluxe Amp!
Posted: Mon May 16, 2011 1:44 am
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The 5U4GB will drop approx. 25 more volts than the GZ34. The 5U4 will draw 3 amps instead of 2 amps on the 5 volt tap. You have to make sure the PT can handle it.

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Post subject: Re: Let's build another Tweed Deluxe Amp!
Posted: Tue May 17, 2011 9:26 pm
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I've gotten my hands on the diodes, but, boy, finding a perfect little terminal board like that is difficult. My Google-fu doesn't seem to be up to the task.

I am learning that there are a lot of interesting Soviet components out there, though.

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Post subject: Re: Let's build another Tweed Deluxe Amp!
Posted: Tue May 17, 2011 9:57 pm
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I picked up a pack of those little terminal boards from a local electronics store the type that sell resistors, capacitors and electronic hobby projects etc.

Over here we call them a "Tag Board"

http://www.jaycar.us/productView.asp?ID ... rm=KEYWORD


Snowy


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Post subject: Re: Let's build another Tweed Deluxe Amp!
Posted: Tue May 17, 2011 10:07 pm
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Once again, you save the day, Snowy. I had found those on the Jaycar AU site, but they showed shipping of about $30 to Texas. Even their U.S. site requires a $25 minimum order. I guess I'll be looking there for other things I "need."

Thanks!

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Post subject: Re: Let's build another Tweed Deluxe Amp!
Posted: Wed May 18, 2011 2:06 am
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I reckon you could use this board from AES. They in the US (Tempe AZ), a lot closer to you.
http://www.tubesandmore.com/

Image

Go to their site linked above and enter P-TS6-2 into the search box. I think it would work out perfect. The extra metal/bulk of those terminal posts would help with a bit of heat dissipation. :idea:


I bought some bits and pieces off those guys a few months ago they were good to deal with.

Snowy


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Post subject: Re: Let's build another Tweed Deluxe Amp!
Posted: Wed May 18, 2011 8:25 pm
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Thanks, Snowy. I've canceled my order with Jaycar and ordered one of these.

Also, the guy with the board shown at the bottom of http://www.vacuumtubesinc.com/Products/SocketsAdaptersParts/AdaptersandParts.aspx? thinks he might be able to dig one up for me as back-up.

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Post subject: Re: Let's build another Tweed Deluxe Amp!
Posted: Thu May 26, 2011 6:41 pm
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Well, Snowy, the diodes made quite a difference. I now have an idle dissipation of about 11.8V on each tube. B+ is 354V.

I ended up with a slightly different combination of diode values than you did. I couldn't easily lay my hands on four 15V diodes, so I went with an arrangement of 2 x 16V, 2 x 14V, 2 x 12V. It totals the same as yours, though, assuming the values are simply additive.

I haven't tested the sound much yet, though a quick test at first power-up suggests the lower voltages will work much better with humbuckers.

Thanks for all your advice!

Ross

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Post subject: Re: Let's build another Tweed Deluxe Amp!
Posted: Thu May 26, 2011 8:58 pm
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That great to hear mate, nice work! 8)

The 11 - 13Watt range for a 5e3 is ideal. I'm sure your tubes will be a lot happier now and it will sound great. :D


Snowy


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Post subject: Re: Let's build another Tweed Deluxe Amp!
Posted: Tue Jan 01, 2013 2:50 pm
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Snowy....
Just a couple of questions about this build, because I to am about to build a 5e3 using the TD PCB, but all other parts from the MOJOTONE kit. I have also ordered all of the stock resistors and caps for the TD kit. I figure I will use the leftovers to build a populated 5e3 fiber board and sell it.

What exactly does the pseudo center tap circuit do? Is it entirely necessary? Maybe I shouldn't include this if the MOJO PT is different than the one with the TD kit?

Did you follow the TB grounding layout to the tee? It doesn't really look like it from your pictures. It looks like the ground from position G9 on the board is not grounded onto the PT bolt.

Have you ever used the Feedback Header / Jumper J1?
If so, what does this option do?
Thanks


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Post subject: Re: Let's build another Tweed Deluxe Amp!
Posted: Tue Jan 01, 2013 5:13 pm
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Hi mobmofo, thanks for checking out my amp build.

I only added the Zener diode circuit to drop some B+ (My Transformer was a Heyboer Deluxe Reverb). I wouldn't add any to yours, just see how it goes and what the tube dissipation ends up being, how it sounds and go from there. You could also sub a different Rectifier as mine runs a GZ34, it'll come down to your own preference and tonal experimentation.

I did my grounding as per the Tube Depot layout, I ran the Black wire from G9 on the board to the PT mounting bolt closest to the Fuse Holder. There are all kinds of ways people will tell you to run the grounding, but I can confirm if you just follow the TD build guide you will have an amazingly quite amp.

Regarding the J1 Jumper, I never played with it, I just installed the jumper cap on the header as per the layout, maybe you could try a switch if you wanted to experiment with how it sounds with/without feedback.

The amp built as per the Tube Depot specs is really a 5E3"+" as they call it on the schematic. I don't know if you are familiar with the Tungsten "Crema Wheat" 5E3 but the Tube Depot builds into an amp very much in that vein. It takes the 5E3 "platform" a bit further, the amp has a fat sound, lovely breakup with a very solid, non-flabby bass even at full tilt. It has more headroom than a trad 5E3 and is louder, but it still has that thick Tweed tone, beautiful cleans too.

You won't be sorry, I just built mine (two actually, because the first one sounded so good!) exactly as per the TD specs and although it's not strictly a trad 5E3, (there are "purists" that hate this kind of thing), I've got to say it's one of the quietest and best sounding amps I've had the pleasure of playing/owning. 8)

Snowy


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Post subject: Re: Let's build another Tweed Deluxe Amp!
Posted: Tue Jan 01, 2013 7:18 pm
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Thanks for answering all of my questions in detail Snowy.
Yes the PCB board in the TD kit looks like one sweet piece of meat. Part of the reason I bought it was because of your detailed threads here.
The kit I bought from Mojotone was to good af a deal to pass up especially when you consider for an extra 25 bucks you can upgrade custom tolex, grill cloth etc.
These are the tubes included;
1 Electro Harmonix 12AY7 / 6072A Vacuum Tube
1 JJ Electronic ECC83 / 12AX7S Vacuum Tube
1 JJ Electronic 5Y3 Vacuum Tube
2 JJ Electronic 6V6 Vacuum Tube
I plan on using the caps and resistors from the Mojotone kit and the board and instructions from the Tube depot kit. The voltage values on the caps are slightly lower, but the resistors are have the same specs except;
4.7K, 2w metal oxide (Mojotone) vs. the Tube Depot
4.7K, 3w metal oxide B+ voltage divider resistor.
I assume the difference is because the TD kit uses the Blackface type PT, Where as the Mojotone PT is is closer to vintage specs. So which one I should use in the build I am still unsure. Will it make a difference? :?:
The TD kit also has these extra resistors;
1 2.7K, 1/2w carbon film feedback resistor
1 47, 1/2w carbon film feedback resistor
2 470, 2w metal oxide screen grid resistors
The feedback resistors obviously wouldn't come into play unless feedback was used via the jumper. Which I was planning to try with a switch mounted in the chassis.
However the screen grid resistors are the ones I am concerned about. They are used to build the pseudo center tap circuit. According to Hoffman amps;
Quote:
"If your power transformer has a green wire with a yellow stripe and it is soldered to the chassis ground you already have a heater supply center tap and you do not have to install the 100 ohm resistors.
I actually prefer the two 100 ohm resistor method because they act like fuses if a power tube plate wire ever shorts out from pin 3 over to pin 2. Pin 2 is one of the heater wires and is a direct short to ground for the high voltage that is found on pin 3. This happens all the time and you can save your power transformer by having the pair of 100 ohm resistors instead of a transformer center tap. The 100 ohm resistors will melt in half if the plate wires ever short out to pin 2. This is way cheaper than replacing a power transformer.
If you want to get rid of your heater supply center tap and replace it with two 100 ohm resistors, all you have to do is unsolder or clip the green/yellow center tap wire and heat shrink or tape it off. You must make sure this wire is tapped off and cannot touch or make contact with the chassis or any other wires. It will just be coiled up inside the amp and not used any more. Add the two resistors by following the instructions below."

Therefor I probably should not use these 2 screen grid resistors. :?: ?
Would you recommend using the caps that come with the MOJOTONE kit;
3 TAD 16uF @ 475V Nominal
3 Sprague 25uF @ 50V (TVA 1306)
4 Orange Drop 0.1uF @ 600V
1 Orange Drop 0.047uF @ 600V
1 Orange Drop 0.0047uF @ 600V
1 Orange Drop 0.022uF @ 600V
1 Silver Mica 500pF@ 500V
or the stock TUBE DEPOT kit caps?
1 500pfd / 500V tone capacitors
1 .0047ufd / 630V tone capacitors
1 .022ufd / 630V coupling capacitors
4 .1ufd / 630V coupling capacitors
1 .01ufd / 630V coupling capacitor (alternate part for C7)
3 22ufd / 50V cathode bypass capacitors
3 22ufd / 500V power supply filter capacitors
Maybe the orange drops would produce a better tone? :?:
HAPPY NEW YEARS :D


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