New Valco Output Transformer - 6V6 Push Pull - National 1224

[HaroldBrooks]

Recently purchased a National (Valco) push pull 6V6 amp and the twin 6" x 11" oval speakers. The speakers have seen better days ; They still work but by the sound of it, they are very worn and have a tiny bit of coil rub just starting.

I want to use the 6" x 9" Vintage 47 speakers that are available as a retrofit for Valco amps using those oval Rolas. The Rola speakers are 4 ohms and run in parallel so you end up with a 2 ohm output transformer as an original.

Here are the speakers :
http://www.vintage47amps.com/V47-Speakers/

To make matters worse though, the stock output transformer is riveted to one of the original speakers, and I am hesitant on drilling it out the original rivets to reuse the output transformer with the new 4 ohm speakers. Running the new speakers in parallel is ok (2 ohms), but I was thinking about using another transformer all together and fully preserve the original speakers and transformer.

Perhaps an 8 ohm output transformer, and just run the new vintage 47 speakers in series to get 8 ohms.

Question : Would this transformer be a good choice ? http://www.classictone.net/40-18063.pdf

If not any other suggestions would be greatly appreciated.

I tried running a single Jensen C12R reissue with this amp, and it sounds far too bright compared to the original oval Rola speakers, and I am hoping the Vintage 47 speakers are what the say they are, that is modeled after the original Rolas.

There is also a problem with shoe horning a decent 10" or 12" speaker into the existing tight combo cabinet. The power transformer is smack in the middle of the chassis and hangs down interfering with a single speaker magnet, hence the need to have the amp stay a twin so the two speaker magnets will clear the transformer.

Thanks for your help !!!

[olddawg]

Why not have the originals reconed? Have you called Weber? If they won’t do it they could probably recommend someone. I know the kits exist. Probably cost less than the replacements.

[HaroldBrooks]

I will call Weber, but I've never seen a recone kit after quite an extensive search and heard of many owner in my same boat.

The 6" x 11" Rola is an odd one, and the only thing I've found even close is a Grundig speaker, and those are original ancient 1950's speakers, just like the Rolas with no other peers.

Thanks though for putting the idea in my head, and I will definitely call Weber to see if they can help, but somehow I don't think they can based on what I've found out so far.

If they can't help with a recone, I am left using the Vintage 47 speakers and another new output transformer.

[Randall]

I vote for recone. I use speakersaver.com here in Florida. Carl does nice work. Also, it should be said that the maker of Classic Tone, Magnetic Components, was the supplier for Valco transformers for a period, and they are making them from the original spec sheets.

[HaroldBrooks]

I vote for recone. I use speakersaver.com here in Florida. Carl does nice work. Also, it should be said that the maker of Classic Tone, Magnetic Components, was the supplier for Valco transformers for a period, and they are making them from the original spec sheets.

I would like to have the original speakers re-coned very much, and would pay a premium to have that done, but it doesn't look like anyone has those cones, or the facility to fix the voice coils. The speakers work, but I believe the voice coils have seen better days.

They are an 'off' size, approx. 7" x 11" (Not 6" x 9"). I've seen ancient Telefunken and one other German speaker in that size, but no new ones, and no re-cone kits. For some reason the Rola ovals were abandoned, and I an not sure why considering the large amount of amps Valco sold with those speakers in the 1950's and just touching on the early 60's.

I will give them a call, but I amp doubtful going in...

Thank you very much for your help Randall, in any event !

[tubeswell]

Weber do a 6 x 9 and they probably have recone parts for these (although nothing listed on their website). Email Brian Spane at Weber (their speaker parts guy).