Fender 5f6 input wiring modification

[swingarm]

EDIT: moved to Amplifiers forum


Greetings I thought this might be the place to ask this question regarding a basic switch mod for my 67 Traynor Bassmaster. Essentially a fender 5f6 Circuit.
Anyway i saw an interesting wiring scheme on Park amp  using a stereo jack at the input from there to a stereo jack at a foot switch then a mono jack input.
This was used to cascade the inputs but i was wondering i i could use this set op to run the amp in bridged or parallel mode using an aditional switch to switch between normal and bright on channel 1 and using channel 2 as parallel

[swingarm]

So this shows either or but i need to bridge the two and have either or controlled by a spdt switch Can anyone suggest how i might do this?

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[ashcatlt]

It took me a lot of head scratching to sort out what you meant by bridged/parallel/ Is what you really want just an A/B/Y with a TRS output rather that 2 x TS? This is the best I can figure. Like this:



...only with (what seems like obvious) modification at the out jacks. The LEDs can be eliminated along with the battery and a pole from each switch.

[sumgai]

Posting edited to remove my analysis of the schematic above, which is for the Park, not for the Traynor, thus making my statements less than applicable.

sumgai

[reTrEaD]

Feb 10, 2016 6:52:20 GMT -5 swingarm said:

a basic switch mod for my 67 Traynor Bassmaster. Essentially a fender 5f6 Circuit.

There's enough similarity between the Traynor YBA-1 and the Fender 5F6 that I'm non uncomfortable with you making that comparison. The Park 1210 is a very different animal.

Feb 10, 2016 6:52:20 GMT -5 swingarm said:

Anyway i saw an interesting wiring scheme on Park amp  using a stereo jack at the input from there to a stereo jack at a foot switch then a mono jack input.
This was used to cascade the inputs

The Park 1210 input configuration and footswitch are uber-slick. You won't be able to mimic that without serious modifications to your amp. But you could do something useful with a footswitch and cables. It would be far less impressive.

Feb 10, 2016 6:52:20 GMT -5 swingarm said:

parallel mode using an aditional switch to switch between normal and bright on channel 1 and using channel 2 as parallel

Iirc, Channel 2 is the "bright" channel. There is very little difference between the two channels other than one capacitor between the CW lug and wiper of the volume control.  If you dime both channels, you won't hear any difference between the two.  The capacitor adds some brightness at lower volume settings.

You could have a footswitch that switches between cables connected to channels 1 and 2.

Or ... you could wire the footswitch such that the cable to channel 2 is always live and the cable to channel 1 is switched on or off.

[ashcatlt]

See now! I was absolutely sure that this was originally posted in Guitar Wiring. My reply included a note to expect movement, but by the time I was done typing and editing and got back to the main page it was in Amps, so I thought it was just too early, and edited my message.

Anyway, the A/B/Y I posted actually works fine as is. If you really want the fancy TRS thing (one cable to the amp instead of two), you'd obviously have to rewire your amp's input. The Bassman scheme I looked at has the same number of tube stages for each channel, so there's no real phase issues there.

OTOH - if I've completely misunderstood and you actually want to modify the thing to put that one tube in series with the other like in the Park, that'll take a bit more thought, but then IDK WTF you are talking about with the switching.

[swingarm]

Thanks for the replies guys.

OTOH - if I've completely misunderstood and you actually want to modify the thing to put that one tube in series with the other like in the Park, that'll take a bit more thought, but then IDK WTF you are talking about with the switching. 

 I had envisioned not having to jumper the inputs and have a normal channel and a internal jumpered channel switchable using this stereo jack method in the park amp schem i posted.

[ashcatlt]

Feb 10, 2016 19:57:41 GMT -5 swingarm said:

Thanks for the replies guys.
I had envisioned not having to jumper the inputs and have a normal channel and a internal jumpered channel switchable using this stereo jack method in the park amp schem i posted.

K, but you also want to switch which of the two channels is the "normal" when they're not jumpered? Then the A/B/Y with the TRS output and replace/rewire the inputs on the amp.

[swingarm]

I wanted to keep the internally  jumpered channel 2 constant and the use a dpst switch to switch between normal and bright on channel 1.

[swingarm]

There's enough similarity between the Traynor YBA-1 and the Fender 5F6 that I'm non uncomfortable with you making that comparison. The Park 1210 is a very different animal.

Yes for sure. I have changed some values through the amp to reflect the more the 59 bassman with some marshall values as well. I plan on doing a gain mod explained on pg 131
of Merlin Blencowes book that bootstrapes the cathode follower to the plate resistor with a 100n cap that can be switched off and on.

[ashcatlt]

Feb 10, 2016 21:33:13 GMT -5 swingarm said:

I wanted to keep the internally  jumpered channel 2 constant and the use a dpst switch to switch between normal and bright on channel 1.

K. So can you work it out from the schematic I posted?

Edit - Can't be dpst, though. Needs two throws.

[swingarm]

Yes it appears to work just fine. Thank you.

[swingarm]

This is another project but will use the same method of  switching. Please confirm that I have wired this properly There are two input and wiring variations at V1 in this layout.
just want to make sure I have not made any errors in the input wiring.

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[ashcatlt]

Yeah, that looks right to me. The input section that is. It's too early for me to sort through the rest of it.

I should mention this is not my diagram. flateric posted it a while back without credit which is maybe not super cool.

I know I've seen that style before, but can't really say for sure where it comes from.

[sumgai]

swingarm, I now see that your posted schematic was for the Park, and not for your amp - my bad assumption.  Please post the Traynor's schematic so that I/we can be sure of any advice we might give you.  I would do like most others here and use a search engine, but it turns out that Traynor used the Bassmaster moniker for about a dozen different models, over the years, which means that I need to rely on you to post the correct one - I ain't gonna guess again!

sumgai

[swingarm]

Hi Sumgai, this is the original schematic 1966 yba-1, SS-rectiier mine used 7027a's and is a 1968 Thanks for your interest.

considering this mod too, Its a noisy control when used (scratchy) be cause of dc on the pot but the reported usefulness is worth it. Its used on Carlsbro 60tc
when used it shifts the amp from power tube distortion to PI distortion. Has anyone tried this? How did you like it?

here is a pic of just the phase inverter modded

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