Whats on your amp workbench?

[MikeC]

PR chassis build for a member here. Components & wiring are complete - she's ready to be powered up for the first time. Dunno about other amp builders but this is the best part for me - I'm about to find out if the hours and care have come to fruition! I'll tidy up the wiring with zip ties once the testing is complete.

[robthemac]

PR chassis build for a member here. Components & wiring are complete - she's ready to be powered up for the first time. Dunno about other amp builders but this is the best part for me - I'm about to find out if the hours and care have come to fruition! I'll tidy up the wiring with zip ties once the testing is complete.

Currently sitting with one of your Princeton amps. Lovely thing. The forumite is in for a treat.

Might I recommend the Jensen P12Q as a speaker option. I'm currently running the Princeton speaker out into an open 1x12 cab with a P12Q. Great balance of sparkly cleans yet smooth enough overdrive.

[TmcB]

PR chassis build for a member here. Components & wiring are complete - she's ready to be powered up for the first time. Dunno about other amp builders but this is the best part for me - I'm about to find out if the hours and care have come to fruition! I'll tidy up the wiring with zip ties once the testing is complete.

Part of me wants to send my Princeton your way to get handwired, after looking at that work!

[MikeC]

She's on the bench now pumping out 14W RMS into a dummy load. Will give her a couple of hours of this.

[MikeC]

And done. She's hot but healthy

[PaulWD]

Here's a 1947 philcophone office intercom now 5f1 ish kind of thing (except for 6sl7 preamp and 6x5 rectifier)

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Scuse the messy bench

[robthemac]

Wild! What does it sound like?

[PaulWD]

I made use of the original choke so this one is a lot quieter than other champs I've made. Clean to overdrive all on your guitar volume. Only about 4w so not super loud

[TmcB]

Spent the afternoon trying to sort out some madness in this Bluesbreaker Reissue 1962

Came with random grounds missing, trem not working (not intentionally), LarMar Master Volume, Cathode Bias with 6V6 tubes.

Have disconnected the Trem from the circuit properly and changed the mixing resistors to JTM45 spec. Changed back to fixed bias with non-master and got some 6L6GC’s in there and it sounds a lot more frightening in the best manner.

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Basically all that getting reversed.
Reason is that I actually bought this amp because JTM45 corn is my favourite clean tone ever, so I give no craps about early breakup, I want deep vibey clean.

Had an absolute mare of a biasing time - had got a new bias probe because old one broke but new one is useless. I figured out that it was useless one I realised that the number I was seeing on the dmm wasn’t the current like I expected. Dumbass me thought oh well I better go and parallel a resistor to get the bias in the right zone. Had a few moments of the tubes biased at 120% until I figured out what was going on and went to transformer resistance bias method.

Going to pop in a cross line master vol and a cut control and see how I like that. If I’m not a fan I’ll go back to LarMar. Also considered making it switchable fixed or cathode biased.

The thing that’s looming is that Marshall have installed the Power Transformer on the wrong orientation so will need to rotate it - will require making the chassis hole wider to fit the other orientation which I am not looking forward to.

[MikeC]

Spent the afternoon trying to sort out some madness in this Bluesbreaker Reissue 1962

Came with random grounds missing, trem not working (not intentionally), LarMar Master Volume, Cathode Bias with 6V6 tubes.

Have disconnected the Trem from the circuit properly and changed the mixing resistors to JTM45 spec. Changed back to fixed bias with non-master and got some 6L6GC’s in there and it sounds a lot more frightening in the best manner.

IMG_5342.jpeg

IMG_5343.jpeg
Basically all that getting reversed.
Reason is that I actually bought this amp because JTM45 corn is my favourite clean tone ever, so I give no craps about early breakup, I want deep vibey clean.

Had an absolute mare of a biasing time - had got a new bias probe because old one broke but new one is useless. I figured out that it was useless one I realised that the number I was seeing on the dmm wasn’t the current like I expected. Dumbass me thought oh well I better go and parallel a resistor to get the bias in the right zone. Had a few moments of the tubes biased at 120% until I figured out what was going on and went to transformer resistance bias method.

Going to pop in a cross line master vol and a cut control and see how I like that. If I’m not a fan I’ll go back to LarMar. Also considered making it switchable fixed or cathode biased.

The thing that’s looming is that Marshall have installed the Power Transformer on the wrong orientation so will need to rotate it - will require making the chassis hole wider to fit the other orientation which I am not looking forward to.

Nice to see sturdy PCBs that are easy to remove/work on AND with visible traces!

[Reg18]

Spent the afternoon trying to sort out some madness in this Bluesbreaker Reissue 1962

Came with random grounds missing, trem not working (not intentionally), LarMar Master Volume, Cathode Bias with 6V6 tubes.

Have disconnected the Trem from the circuit properly and changed the mixing resistors to JTM45 spec. Changed back to fixed bias with non-master and got some 6L6GC’s in there and it sounds a lot more frightening in the best manner.

IMG_5342.jpeg

IMG_5343.jpeg
Basically all that getting reversed.
Reason is that I actually bought this amp because JTM45 corn is my favourite clean tone ever, so I give no craps about early breakup, I want deep vibey clean.

Had an absolute mare of a biasing time - had got a new bias probe because old one broke but new one is useless. I figured out that it was useless one I realised that the number I was seeing on the dmm wasn’t the current like I expected. Dumbass me thought oh well I better go and parallel a resistor to get the bias in the right zone. Had a few moments of the tubes biased at 120% until I figured out what was going on and went to transformer resistance bias method.

Going to pop in a cross line master vol and a cut control and see how I like that. If I’m not a fan I’ll go back to LarMar. Also considered making it switchable fixed or cathode biased.

The thing that’s looming is that Marshall have installed the Power Transformer on the wrong orientation so will need to rotate it - will require making the chassis hole wider to fit the other orientation which I am not looking forward to.

This is the one that was in Geraldine aye?
Nice score, it wasn’t too badly priced either.

[TmcB]

Nice to see sturdy PCBs that are easy to remove/work on AND with visible traces!

How good, right? People go on about PCBs in amps being evil but when done like this it's a joy to work on.
Helps that they haven't tried to cram everything in on it.

[TmcB]

This is the one that was in Geraldine aye?
Nice score, it wasn’t too badly priced either.

Yeah, that’s the one! He offered a very good price and I couldn’t help but go for it. Has needed some help though…

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Wee bit of daylight between the ground buss and the pots (one was critical) - had come off with the pots being tightened all the way in because the chassis screws (possibly replacements) were too long and were grounding out the treble and intensity pots

[AiRdAd]

Jtm45 is my favorite clean too. I didn't realise they had 6l6s in them

[Slowy]

Jtm45 is my favorite clean too. I didn't realise they had 6l6s in them

They didn't. It's reverting to its Bassman origins.