"Twin" power xfmr for 4-EL34
Moderators: pompeiisneaks, Colossal
"Twin" power xfmr for 4-EL34
Folks,
Every "Twin" power xfmr I find lacks sufficient heater current for 4 EL34s and any preamp tubes. The CEDist/AES one only has 5.5A. The Weber one only has 6A (JUST enough for the EL34s, none left for the preamp tubes). Haven't found the ratings for Mercury or Heyboer.
What laydown power xfmr will work SAFELY running 4 EL34?
Thanks,
Michael
Every "Twin" power xfmr I find lacks sufficient heater current for 4 EL34s and any preamp tubes. The CEDist/AES one only has 5.5A. The Weber one only has 6A (JUST enough for the EL34s, none left for the preamp tubes). Haven't found the ratings for Mercury or Heyboer.
What laydown power xfmr will work SAFELY running 4 EL34?
Thanks,
Michael
Wife: How many amps do you need?
Me: Just one more...
Me: Just one more...
- Funkalicousgroove
- Posts: 2232
- Joined: Mon Jul 25, 2005 8:04 pm
- Location: Denver, CO
- Contact:
Re: "Twin" power xfmr for 4-EL34
That is what is in all the EL34 Dumble amps I've seen.
Keep in mind that the ratings given for the Fender trannies are based on 1960's materials, and modern 1000V wire with modern insulation and such should handle the current.
I can call Alden at heyboer tomorrow and ask him about the ones I have on order.
You can always use a little Hammond Filament tranny for either your pre's or your OT's if you're really worried about it.
Keep in mind that the ratings given for the Fender trannies are based on 1960's materials, and modern 1000V wire with modern insulation and such should handle the current.
I can call Alden at heyboer tomorrow and ask him about the ones I have on order.
You can always use a little Hammond Filament tranny for either your pre's or your OT's if you're really worried about it.
Owner/Solder Jockey Bludotone Amp Works
-
- Posts: 1105
- Joined: Tue Feb 07, 2006 4:52 am
Re: "Twin" power xfmr for 4-EL34
i`m using a dual showman power ( 70`s) w/EL`s, and its COOL as a cucumber..jp@Omegaampsmlp-mx6 wrote:Folks,
Every "Twin" power xfmr I find lacks sufficient heater current for 4 EL34s and any preamp tubes. The CEDist/AES one only has 5.5A. The Weber one only has 6A (JUST enough for the EL34s, none left for the preamp tubes). Haven't found the ratings for Mercury or Heyboer.
What laydown power xfmr will work SAFELY running 4 EL34?
Thanks,
Michael
Re: "Twin" power xfmr for 4-EL34
You could contact Dave Allen and see if he has any ToneSaver PT's left. He seemed to have spec'd most PTs he uses for EL-34s. Assuming they're Heyboer, he may give you the part number.
Re: "Twin" power xfmr for 4-EL34
I bought a 'super/bassman/bandmaster' replacement TP40 transformer from Dave Allen a while back. The 6.3V winding is rated at 5A. It has these numbers stamped on it:jaysg wrote:You could contact Dave Allen and see if he has any ToneSaver PT's left. He seemed to have spec'd most PTs he uses for EL-34s. Assuming they're Heyboer, he may give you the part number.
M1529P2
989 0338
Are those Heyboer numbers?
"Let's face it, the non HRMs are easier to play, there, I've said it." - Gil Ayan... AND HE"S IN GOOD COMPANY!
Black chassis' availble: http://cepedals.com/Dumble-Style-Chassis.html
Black chassis' availble: http://cepedals.com/Dumble-Style-Chassis.html
Re: "Twin" power xfmr for 4-EL34
989 is Marvel Electric
996 is Heyboer
Randy
996 is Heyboer
Randy
Re: "Twin" power xfmr for 4-EL34
Yes - that would make sense as I recall the transformers came from Chicago. So are Marvel Electric any good?RB wrote:989 is Marvel Electric
996 is Heyboer
Randy
"Let's face it, the non HRMs are easier to play, there, I've said it." - Gil Ayan... AND HE"S IN GOOD COMPANY!
Black chassis' availble: http://cepedals.com/Dumble-Style-Chassis.html
Black chassis' availble: http://cepedals.com/Dumble-Style-Chassis.html
- Funkalicousgroove
- Posts: 2232
- Joined: Mon Jul 25, 2005 8:04 pm
- Location: Denver, CO
- Contact:
Re: "Twin" power xfmr for 4-EL34
I just heard back from Alden, All of the trannies I have on order will have 7A filament taps, do you want me to get you an extra? it also has an addl 6.3v@350mA to run the relays.
Owner/Solder Jockey Bludotone Amp Works
Re: "Twin" power xfmr for 4-EL34
How much?Funkalicousgroove wrote:I just heard back from Alden, All of the trannies I have on order will have 7A filament taps, do you want me to get you an extra? it also has an addl 6.3v@350mA to run the relays.
Wife: How many amps do you need?
Me: Just one more...
Me: Just one more...
- Funkalicousgroove
- Posts: 2232
- Joined: Mon Jul 25, 2005 8:04 pm
- Location: Denver, CO
- Contact:
Re: "Twin" power xfmr for 4-EL34
They are like $90 + S&h to me, then to you.
FYI Hammond filament transformers are like $15
FYI Hammond filament transformers are like $15
Owner/Solder Jockey Bludotone Amp Works
Re: "Twin" power xfmr for 4-EL34
Thanks - I think that approach will certainly make more sense ($$). Looking forward to the new chassis run!
Wife: How many amps do you need?
Me: Just one more...
Me: Just one more...
- Funkalicousgroove
- Posts: 2232
- Joined: Mon Jul 25, 2005 8:04 pm
- Location: Denver, CO
- Contact:
Re: "Twin" power xfmr for 4-EL34
If you already have a PT then the little filament trannie is the way to go, you can use a small one for just your preamp tubes and have them on a separate DC circuit if you want.
If you don't already have a PT then the All in one will end up being cheaper.
Lemme know if you need me to get you one of those Hammonds (I get them at/near cost)
If you don't already have a PT then the All in one will end up being cheaper.
Lemme know if you need me to get you one of those Hammonds (I get them at/near cost)
Owner/Solder Jockey Bludotone Amp Works
Re: "Twin" power xfmr for 4-EL34
I have the PERFECT power xfmr for this app, except that it is a standup guy, not a laydown guy. I may try to rig up a plate over that hole so I can use this one. We'll see. Thanks.
Anyone have some "scrap" 1/8" thick aluminum to cover that hole?
Anyone have some "scrap" 1/8" thick aluminum to cover that hole?
Wife: How many amps do you need?
Me: Just one more...
Me: Just one more...
- Funkalicousgroove
- Posts: 2232
- Joined: Mon Jul 25, 2005 8:04 pm
- Location: Denver, CO
- Contact:
Re: "Twin" power xfmr for 4-EL34
Why not just change the Bells?
Owner/Solder Jockey Bludotone Amp Works
Re: "Twin" power xfmr for 4-EL34
I would need longer screws to convert it to a Z-mount, and the only time I ever tried to change the screws in a xfmr I found that they did NOT want to come out, and I thought I would be ruining the xfmr. How difficult is it to change this? FYI- the xfmr is a NOS Stancor.Funkalicousgroove wrote:Why not just change the Bells?
Wife: How many amps do you need?
Me: Just one more...
Me: Just one more...