5E2 Princeton - 1st build wiring check

[andrewRneumann]

Has anyone done an engineering review on all the hum loops created by laced turrets?

 

[Blue Bill]

Keith, looks great so far. May I ask where you got your components?

 

[King Fan]

Has anyone done an engineering review on all the hum loops created by laced turrets?

Heh, Andy, I’m gonna emphasize your wink there. You’re a pro, so people may take even your ironic comments as gospel.

I"m not a pro, but I think Doug laces turrets with 24ga wire. Even if it's 22ga, the looping figure 8 seems entirely equivalent to a chunk o' wire. A chunk o' wire holding two turrets at equal potential doesn’t seem like it creates a ground loop. There's every chance I'm wrong, but if you’re serious I’d need evidence.

 

[andrewRneumann]

Heh, Andy, I’m gonna emphasize your wink there. You’re a pro, so people may take even your ironic comments as gospel.

I"m not a pro, but I think Doug laces turrets with 24ga wire. Even if it's 22ga, the looping figure 8 seems entirely equivalent to a chunk o' wire. A chunk o' wire holding two turrets at equal potential doesn’t seem like it creates a ground loop. There's every chance I'm wrong, but if you’re serious I’d need evidence.

You are correct to take emphasis on the wink. I will be more careful with my sarcasm! OP, please keep your laces tied.

I’m an amateur at best, and my understanding is that every loop of wire (with no intervening impedance) is susceptible to picking up electromagnetic noise at some frequency and level. Are laced turrets seen in HiFi rigs, radio receivers, or sensitive valve instruments? (Not a rhetorical question… does anyone have examples of laced turrets construction outside of guitar amps?) I would take my wiring cues from those dudes. But in guitar amp world, none of that *really* matters and history shows that laced turrets look fancy and work just fine.

 

[Lowerleftcoast]

Has anyone done an engineering review on all the hum loops created by laced turrets?

That would be one of the questions asked at "The Bridge of Death".

 

[KeithAmpsIt]

Keith, looks great so far. May I ask where you got your components?

I got the parts from a smorgasbord of places.
Tube Depot: Resistors, capacitors, choke and Jensen speaker
Ted Weber: Chassis, chicken head knobs
Amplified Parts: Power and Output transformers
Fuzz Audio and Viva Tubes: Tubes
Hoffman: all the other parts

 

[KeithAmpsIt]

I’ve insulated the B+ wires over the ground wires. Did the RobRob amp startup procedure using a light bulb current limiter. That testing went great. Turning the volume all the way up and absolutely no background sounds! Been working on building the cabinet. Photos show my dry fit in the cabinet. The sound and tone are awesome! I appreciate the help from everyone on this forum in helping make it possible!

 

[jsnwhite619]

Just wait until that speaker breaks in after a few weeks - don't baby it! Jensens need a good ol' fashioned beat down to get to their best form.

 

[KeithAmpsIt]

Just wait until that speaker breaks in after a few weeks - don't baby it! Jensens need a good ol' fashioned beat down to get to their best form.

Hard part now is taking it apart to finish the cabinet

 

[2L man]

There are two kind lever switches. Other contact is opposite side the lever is and another is same side. These later type usually have higher rating when its switching inside comes faster and cost more because mechanism is big more complicated. Just messure resistance and you know what yours is.

 

[KeithAmpsIt]

I’ve finished the 5E2 amp! Getting it covered was the most anxious part! Thought of a trick to using the spray adhesive. Covered the sides with blue tape so I could spray the cabinet and tweed in two stages. Had a nameplate made from AwardsEtc on Etsy.com. They do a great job and quick! Posting some pics of it done . I want to thank all on this forum for the great advice and knowledge to make it successful!

 

[chas.wahl]

Looks great! I won't pretend to understand what you did with the painter's tape, and spraying in two stages -- not clear to me. Picture shows how you masked pieces of tweed, but what next?

 

[KeithAmpsIt]

Looks great! I won't pretend to understand what you did with the painter's tape, and spraying in two stages -- not clear to me. Picture shows how you masked pieces of tweed, but what next?

Thanks! Good question on the tape. The adhesive gets sprayed to both the tweed and the cabinet. I didn’t want to spray the entire cabinet at once. So I sprayed just the tape protected tweed sides, cabinet sides, applied and fitted them to the cabinet. With the sides done, the second stage I sprayed the top and bottom of the cabinet. Since the tweed sides were protected by the tape, the spray adhesive didn’t get on the tweed I just finished. I then completed it by applying the top and bottom pieces. I also protected the cabinet interior with tape so the adhesive didn’t get all over the inside.