Which reverb transformer in a JM type build?

[brewdude]

I am planning a JM type build and was looking at the reverb section on this schematic: https://tubeamparchive.com/download/file.php?id=30388

I have never built an amp with reverb.
What transformer should I buy?
What reverb pan? How many springs? Long or short?

What tube should it be driven with? It looked like the schematic listed a 5751, but I was wondering if a 12AU7 would be a better choice?

[M Fowler]

I used Magnetic Components Fender Twin Reverb transformer set which includes the PT, OT, Choke and reverb driver transformer.

For reverb pan I am currently using the 9AB2C1B Mojo Reverb Tank (Fender 3-Spring Medium Decay) but you can use long tanks compatible with your reverb driver transformer see this https://www.tubesandmore.com/products/r ... s/articles

Tubes you can use 12AX7 for more gain 12AT7, 12AY7, 12AU7 or 5751 based on how much reverb signal you like, play by ear, for what suits you.

Mark

[mhartman]

I agree with Mark. Same iron set as a twin reverb.

[brewdude]

Thank you for the replies.

It looks as if the #22921 Fender Reverb Driver is the one that comes with the transformer sets. It looks like it matches 15k plate load to 8 ohm reverb tank... Rated 3.5W, 5mA DC... Typically used with 12AT7 tube with 2 sections run in parallel, but could also be used with 6BQ7, 12AU7 or 6SN7.

Than there is the #40-18034 Fender Vintage Style Reverb Driver. Looks like it matches a 25k plate load to 8 ohm reverb tank... Also rated 3.5W.

I also found that there is a similar choice to be made between the #22699 Fender Choke and the #40-18003 Fender Vintage Style Choke. Both are rated 4H @ 90mA, but the first one lists 110 ohms the vintage one 105 ohms.

There doesn't seem to be much difference in cost between the choke/driver and the vintage choke/driver. Is there actually any practical difference?

[BarryW]

I'm not sure about the choke differences, but I also used the Mag Comp twin reverb set. It really came out great.