PT for a quad of KT 88's
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PT for a quad of KT 88's
I have built a Stereo amp using 4- KT 88's and 3 - 12AU7's that I need a proper power transformer for. I want to end up with 450 - 500 volts with solid state rectification. I figure I need at least 650 ma of plate current capacity and about 8 amps of 6.3 volt heater current. Any suggestions on a source for such a critter?
- martin manning
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Re: PT for a quad of KT 88's
Check listings at Edcor: https://www.edcorusa.com/xpwrseries-1#/ ... geNumber=6
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Re: PT for a quad of KT 88's
Thanks Martin, I don't see anything there that looks stout enough.
Re: PT for a quad of KT 88's
If you are willing and patient, you might find what you are looking for on eBay. Example:
https://www.ebay.com/itm/Pair-of-Older- ... rk:35:pf:0
https://www.ebay.com/itm/TRANSFORMER-PO ... 1209!US!-1
https://www.ebay.com/itm/classic-tube-a ... 1209!US!-1
You might choose to make some compromises to power the amp. I'm guessing you need about 250mA on the primary? You might consider a separate 6.3V transformer to get what you need to power the quad of KT88's.
I think the transformer you are seeking will weigh in around 10 pounds!
https://www.ebay.com/itm/Pair-of-Older- ... rk:35:pf:0
https://www.ebay.com/itm/TRANSFORMER-PO ... 1209!US!-1
https://www.ebay.com/itm/classic-tube-a ... 1209!US!-1
You might choose to make some compromises to power the amp. I'm guessing you need about 250mA on the primary? You might consider a separate 6.3V transformer to get what you need to power the quad of KT88's.
I think the transformer you are seeking will weigh in around 10 pounds!
Re: PT for a quad of KT 88's
Hello -
Hammond builds beasts in this class. Have a careful look through biggest of their 300 series.
Best .. Ian
Hammond builds beasts in this class. Have a careful look through biggest of their 300 series.
Best .. Ian
Re: PT for a quad of KT 88's
Call up Heyboer and give them the specs you want for your PT (they may ask a few questions):
https://www.heyboertransformers.com/tubeamps.shtml
I had them wind up some PT's with similar specs for a few 6L6GC x 6 Hi Gain projects.
Very happy with the custom PT's they provided.
They were also less expensive than I thought they would be because it eliminates the markup of any middleman vendor.
Heyboer makes transformers of many different types, not just audio transformers, so it's just another order to them----- as long as it's not a transformer that's available "off the shelf" from one of their major tube guitar amp customers such as Mojotone.
https://www.heyboertransformers.com/tubeamps.shtml
I had them wind up some PT's with similar specs for a few 6L6GC x 6 Hi Gain projects.
Very happy with the custom PT's they provided.
They were also less expensive than I thought they would be because it eliminates the markup of any middleman vendor.
Heyboer makes transformers of many different types, not just audio transformers, so it's just another order to them----- as long as it's not a transformer that's available "off the shelf" from one of their major tube guitar amp customers such as Mojotone.
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Re: PT for a quad of KT 88's
Classictone has a big project transformer that works great too.
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Re: PT for a quad of KT 88's
Jelle, I see the 100 watt PT Classistone has but nothing larger. Is there a part number I'm missing?
I currently have the amp up and running with a 100 watt Fender PT, however, It gets REALLY hot when using
KT 88's. I am having to us KT 66's presently.
I currently have the amp up and running with a 100 watt Fender PT, however, It gets REALLY hot when using
KT 88's. I am having to us KT 66's presently.
Re: PT for a quad of KT 88's
Terry,
The Hammond 378CX is what I have been using for four KT88 bass amps, suggested by Jelle.
I use the Hammond 1650TA OT
Mark
The Hammond 378CX is what I have been using for four KT88 bass amps, suggested by Jelle.
I use the Hammond 1650TA OT
Mark
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Re: PT for a quad of KT 88's
If you have the chassis room and want top notch performance you can have PT do the V+ and one for the heater power.
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
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Re: PT for a quad of KT 88's
After looking closer at the Classictone project PT, I see it has 10 amps of filament power. This is probably where most of my heating problems are coming from on the Fender PT with only about a 6 amp capacity. There are a lot of possibilities for selection of higher B+ voltages as well. This looks like the best option so far. Thanks Jelle!