Gibson Falcon missing reverb transformer.

[rf7]

I've got a Falcon that is missing it's reverb transformer. How do I figure out what an appropriate replacement would be for it?

It's driven by the plate of a 7199 and the reverb tank is a Hammond 17" with no model number on it. The output of the tank seems to be an open circuit, according to my meter. So I may just be replacing that tank also.

[capnjuan]

I've got a Falcon ...missing it's reverb transformer... How do I...

Hi rf7; Here's a link to Mercury Magnetics; http://www.mercurymagnetics.com/pages/mainframe.htm

Down the page, there's a Gibson 'GA RV' model suggesting that it might be compatible with many / most / all Gibson designs; they could tell you for sure.

Re/ reverb can, the Accutronics people are pretty good about working with you to determine which of their models matches up.

Good luck! JH

[Enzo]

If an end of the pan is open, it is no good.

How far off can the standard Fender reverb transformer be? I'd try one of those and ise a plain old 4AB2C1B.

The Falcon drawing I have shows a 12AT7 driving things. Typical of Gibson...

[rf7]

Hi rf7; Here's a link to Mercury Magnetics; http://www.mercurymagnetics.com/pages/mainframe.htm

Down the page, there's a Gibson 'GA RV' model suggesting that it might be compatible with many / most / all Gibson designs; they could tell you for sure.

Re/ reverb can, the Accutronics people are pretty good about working with you to determine which of their models matches up.

Good luck! JH

Yeah, I talked to Mercury Magnetics about this yesterday. They were very helpful, but without the actual transformer, no one is sure what it should be.
Gibson's parts listing shows 3 different reverb transformers (TF-6401, TF-6402, and TF-6846). Mercury makes one of those, and I don't know if that is what I need.

If an end of the pan is open, it is no good.

How far off can the standard Fender reverb transformer be? I'd try one of those and use a plain old 4AB2C1B.

The Falcon drawing I have shows a 12AT7 driving things. Typical of Gibson...

Yeah, that's what I'm going to do is use the Fender transformer and reverb. I found 2 different Falcon schematics, one which shows a 7199 driving the reverb txfrmr. The triode of the 7199 has a plate impedance of 8K ohms, I believe, while the Fender transformer has an input impedance of 25K ohms, so I don't think it will get the full power out of the tube, but it should do something, I hope.

[capnjuan]

...but without the actual transformer, no one is sure what it should be. Gibson's parts listing shows 3 different reverb transformers (TF-6401, TF-6402, and TF-6846). Mercury makes one of those, and I don't know if that is what I need....to do is use the Fender transformer and reverb. I found 2 different Falcon schematics, one which shows a 7199 driving the reverb txfrmr. The triode of the 7199 has a plate impedance of 8K ohms...I hope.

There are 3 public domain schematics for the GA19RVT; the 'tweed' version; 7199 reverb operator at V2 (#'d left to right), the 'crest 01' w/ 6CA4 at V2 (#'d right to left ), and 'crest 02' w/ a 12AX7 at V2 (unsure of orientation; has 6BQ5s).

Which model/tube do you have? I have a tweed/7199 but haven't ever recorded the part # from the reverb trfmr ... If you have a 7199 at V2; 2nd from the left viewed from the rear, email me at jmhenderson at bellsouth dot com - I'll go look at trfmr # and reply... John

[Amp Kat]

I just checked the Falcon in my shop and the numbers on the reverb tranny are E-6400 and another number was 166335. The ohms on the reverb pan side was 175 ohms. Can't see why a regular Fender BF type wouldn't work just fine.

[capnjuan]

Hi Amp Kat: which model do you have in your shop? J

[rf7]

There are 3 public domain schematics for the GA19RVT; the 'tweed' version; 7199 reverb operator at V2 (#'d left to right), the 'crest 01' w/ 6CA4 at V2 (#'d right to left ), and 'crest 02' w/ a 12AX7 at V2 (unsure of orientation; has 6BQ5s).

Which model/tube do you have? I have a tweed/7199 but haven't ever recorded the part # from the reverb trfmr ... If you have a 7199 at V2; 2nd from the left viewed from the rear, email me at jmhenderson at bellsouth dot com - I'll go look at trfmr # and reply... John

I've got the crest 01 with a 6C4 in V2. I believe a 6CA4 is a rectifier tube. Where did you find that schematic?

[Amp Kat]

Hi Amp Kat: which model do you have in your shop? J

Sorry I'm not sure but I'll let you know when I go back. Anything else you need while I'm at it ?

[capnjuan]

I've got the crest 01 with a 6C4 in V2. I believe a 6CA4 is a rectifier tube. Where did you find that schematic?

Yes; you're right. The 6CA4 is a rectifier; 6C4 shown. Don't recall where the schematic came from; labelled M-216 RVT suggesting a 'Maestro' model? It also labels the 6C4 as V3; third from the right w/ rightmost labelled V1. If you want it, PM me w/ your email address. John

[rf7]

Thanks John, I found that schematic elsewhere.

[capnjuan]

Not really; given the 3 different tubes used in the GA19 reverb, I was wondering whether Gibson used the same reverb transformer for all three. j

[UnexplodedCow]

This may be a bit latent (had to add to the fray), but I have a Tweed Falcon around with a now dead reverb transformer. The number on the frame of it is E-6400.. A smaller number on it is 166201 (I'm guessing serial number or year of make). It's driven by a 7199 tube for the record.

[rf7]

This may be a bit latent (had to add to the fray), but I have a Tweed Falcon around with a now dead reverb transformer. The number on the frame of it is E-6400.. A smaller number on it is 166201 (I'm guessing serial number or year of make). It's driven by a 7199 tube for the record.

Mercury makes a copy of that E-6400 transformer. I went with a Fender clone, it's cheaper and worked fine.

[UnexplodedCow]

Does anyone know the winding count and/or the resistance values of the primary and secondaries on the reverb transformer?