new build 36lite with vvr

Double-Bubble! Place for discussing the 36W version...

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chaliapin
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Re: new build 36lite with vvr

Post by chaliapin »

Pretty sure this is my OT so that's another thing cleared up.

https://www.trans-amp.co.uk/productinfo ... tem=TT4121

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Re: new build 36lite with vvr

Post by chaliapin »

So on my layout, the screen from the PT is connected between r25 and 26. I don't want to connect this to the power tube do I? Where should I put it?

Also I'm concerned about soldering 2 heater wires AND a resistor onto the heater pins for the elevated heater circuit. The pins look quite small to me...

Lastly can I connect the pilot light to the 5v pins on the gz34 instead of the heater circuit for all the other tubes? My schematic has it across the mains voltage but the light says 6v on it so that can't be right...

Hope im using all the right words and making some sort of vague sense...

Thanks all for your help and patience.

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Re: new build 36lite with vvr

Post by Bieworm »

chaliapin wrote:
Tue 11/15/22 4:26 pm
So on my layout, the screen from the PT is connected between r25 and 26. I don't want to connect this to the power tube do I? Where should I put it?

Also I'm concerned about soldering 2 heater wires AND a resistor onto the heater pins for the elevated heater circuit. The pins look quite small to me...

Lastly can I connect the pilot light to the 5v pins on the gz34 instead of the heater circuit for all the other tubes? My schematic has it across the mains voltage but the light says 6v on it so that can't be right...

Hope im using all the right words and making some sort of vague sense...

Thanks all for your help and patience.

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You can/should attach the 6.3VAC heater wires to the pilot light. When you use a double solder terminal, you can run the wires from the PT to that terminal. From there you run 2 sets of wires, 1 set for the pilot and the other set for the heaters. This terminal is an ideal location for attaching the artificial CT too...

Important: put the terminal very near the pilot light. This to avoid having 2 parallel circuits from the 6.3VAC winding.
solder terminal.png
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chaliapin
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Re: new build 36lite with vvr

Post by chaliapin »

Ok great, solder terminal.
This is a pot with dpst switch on it isn't it?

It's supposed to be my on off and vvr combined. I can use it just as a power switch for the moment can't I?Image

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Re: new build 36lite with vvr

Post by Bieworm »

That depends on the power rating of that dip switch .don't put yourself in danger
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Re: new build 36lite with vvr

Post by chaliapin »

It says 250 ac so I should be good. Did my tube town order finally. Still haven't got up the courage to actually solder anything though...

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Re: new build 36lite with vvr

Post by Bieworm »

chaliapin wrote:
Thu 11/17/22 3:32 am
It says 250 ac so I should be good. Did my tube town order finally. Still haven't got up the courage to actually solder anything though...

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Lol 😀... wait until you get the hang of it... I never stopped soldering ever since
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Re: new build 36lite with vvr

Post by chaliapin »

Hope so!

So couple more small questions.

Wire colours, what where?

Heat shrink, where to use it?

Thanks.

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Re: new build 36lite with vvr

Post by chaliapin »

Yeah and a couple more sorry. I have 4 cliff jacks, inputs and speaker outputs. They seem identical, I THINK they are switched. Where should switched and non switched jacks be used?

Sorry for so the bog basic questions...

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Re: new build 36lite with vvr

Post by JMPGuitars »

The answer to those questions can be found in my layouts. For example: files/JMPGuitars_18_Watt_Tremolo_TMB_Layout.pdf

You can use whatever colors you want, but it's easier to troubleshoot if you follow a simple scheme. 1 color for each type. In my newer layouts, I do red for plates, black for cathodes, etc.. As long as you're consistent, it's all good.

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Re: new build 36lite with vvr

Post by Bieworm »

chaliapin wrote:
Fri 11/18/22 2:02 pm
Hope so!

So couple more small questions.

Wire colours, what where?

Heat shrink, where to use it?

Thanks.

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In my case i put heat shrink on every stripped wire to avoid the coat melting open

Colors are a personal choice, but be structural. My choices are:
Brown and black for heaters
Red for plate wires
Blue for grid wires
Black for cathode wires
Black for grounds
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Re: new build 36lite with vvr

Post by chaliapin »

Thanks guys, I'll work out a colour scheme...

Sorry Josh, I understand how you wire the jacks. I just don't understand switched or un switched, my four all look the same. Does the wiring make them switched or not?
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Re: new build 36lite with vvr

Post by Bieworm »

chaliapin wrote:
Sat 11/19/22 11:26 am
Thanks guys, I'll work out a colour scheme...

Sorry Josh, I understand how you wire the jacks. I just don't understand switched or un switched, my four all look the same. Does the wiring make them switched or not?
Aren't they cliff jacks? I thought they are all switched. The wiring layout determines whether they make use of the switch or not.
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Re: new build 36lite with vvr

Post by chaliapin »

I realised that must be it after looking at every cliff Jack picture on the internet and deciding they all looked the same...

Braved my first bit of soldering. Did a fair bit years ago but to honest I feel like it's the first go I've had. These are the input jacks with r1 and 2 and bare wire connections. I can do them again if they're really crap...
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Re: new build 36lite with vvr

Post by Bieworm »

I wonder why there are 2 pcs 1M grid load resistors on that input combo? Now you get the situation that when you plug into the 2nd input the 1M resistors get parallelled, resulting in a 500k grid load...
I always put only one 1M resistor at a double input configuration.

Watch out that the most right resistor doesn't touch the chassis when mounted. This could create a ground loop...
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Re: new build 36lite with vvr

Post by chaliapin »

Yeah I couldn't find my good wire clippers to trim.

Attached the relevant part of schematic and layout. I don't really understand the significance of one or two resistors.
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Re: new build 36lite with vvr

Post by JMPGuitars »

The 1M resistors are only in parallel with the parallel input active. Merlin says there's not much difference between 1M or 500K at the input, and that situation is fairly common with Marshall amps.

Do it either way, and don't overthink it. ;)
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Re: new build 36lite with vvr

Post by chaliapin »

Great thanks. Decided a should probably rotate my OT before going any further... will the wiring going round like this cause any trouble?
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Re: new build 36lite with vvr

Post by Bieworm »

chaliapin wrote:
Sun 11/20/22 11:19 am
Great thanks. Decided a should probably rotate my OT before going any further... will the wiring going round like this cause any trouble?
Don't worry about that
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Re: new build 36lite with vvr

Post by chaliapin »

Thanks bieworm, I assume you mean not to worry about the wires, rather than don't bother rotating the OT?

Made a start on the heater wiring. Yes, it was really fiddly getting two of the thick heater wires through the pins. Not very pleased with my solder joints, I'd like to blame my cheap silverline solder but we all know it's the cut price skills wielding the iron which are the issue...
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