Perfect specs for 36W PT/OT?

[Cknopp]

I have the preferred specs for the 18watt, but I am looking for the specs needed for a 36W unit. I am looking to get a layout of the mains, secondary, filament, OHMs and so on for the PT and OT transformers

As always, I greatly appreciate any education that is intelligently offered!

THANKS!

Chris

[Cknopp]

No one can tell me what voltages and stuff are "perfect" for a 36watt power tranny, or what is needed for a 36watt output tranny?

Do I simply double the values for the 18 watt items?

Thanks!

[Cknopp]

im placing an order for some 18watt trannies, I just want to add some 36watt ones on the order too. I will check his site for the details.

Thanks!

[what_wires]

Graydon currently has a 10% sale on his transformers. Not to mention his stuff absolutely ROCKS.

[Cknopp]

I don't doubt it, but I am about to place an order for the 18 watt toroid transformer sets, and I can add the 36 watt trannies and get free shipping.

Can anyone direct me to the information?

I found this for the PT:
290-0-290@200mA
6.3v@6A
5v@3A

Is this what is best for the 36watt PT?

Still looking for the specs on the OT, so any help is appreciated!

[sub]

Still looking for the specs on the OT, so any help is appreciated!

Primary impedance: 4Kohm
Secondary: 4-8-16 ohm (or 8-16 ohm or only 8 ohm... optional.. )
Power: 30+W

[Cknopp]

Thanks!

To be honest, I actually figured that out earlier today...

Once I realized that the only real difference on the output over the 18watt is that it has the tubes in paralell, thus halving the Ohms, I realized that the 8kOhm 18watt tranny had to be dropped to 4kOhm.

I do appreciate your response as well!

Thank you!

[menger]

I'd email graydon @ gds right away hes having a deal on iron i just copped a 36watt set yesterday and the deal can't be beat and its some sweet iron the only difference in the iron is opt 4k and the pts more like 200 250 ma and you get optian for a octal recto FOR REAL EMAIL HIM ASAP mark

[Cknopp]

I'd email graydon @ gds right away hes having a deal on iron i just copped a 36watt set yesterday and the deal can't be beat and its some sweet iron the only difference in the iron is opt 4k and the pts more like 200 250 ma and you get optian for a octal recto FOR REAL EMAIL HIM ASAP mark

Maybe I am being unclear here?

I have no interest in purchasing these transformers to build my own amps. I just am interested in what changes need to be made in comparison to an 18watt transformer.

I am placing the order for the 18 watt transformers soon, so I want to add some 36 watt PT/OT as well to combine the shipping.

I appreciate Graydon's transformers for what they are, but mine are toroid, so not even close to the same thing, other than output.

If the 18 watt is:
290-0-290 @ 300mA
3.15-0-3.15 @ 2A
0-5-6.3 @ 3A

What has to change for a 36 watt version?

Thanks!

Chris

[Shrapnel]

I appreciate Graydon's transformers for what they are, but mine are toroid, so not even close to the same thing, other than output.

If the 18 watt is:
290-0-290 @ 300mA
3.15-0-3.15 @ 2A
0-5-6.3 @ 3A

What has to change for a 36 watt version?

Thanks!

Chris

Since your toroid already delivers up to 300mA, you are already covered. IIRC, a standard 18Watt is 100-120mA, and most 36Watt PTs are only about 200mA.

[skilpadda]

Would not that 3.15-0-3.15@2A heater winding be too small even for an 18watt

Preamp 3 12ax7 @0.3A (0.3*3) 0.9A
Poweramp 2 EL84 @0.75A (0.75*2) 1.5A

So an 18watt would need about 2.5A
And a 36watt an additional 1.5A for a total of 4A

Otherwise the transformer would do well for both.

This is from the top of my head so please correct me if I am wrong.

[Cknopp]

I may have reversed the 3.15 and the 0-5-6.3 amperages...

I sent the toroids that I purchased to builders on this forum already for testing, so I don't recall the exact specs, and the .pdf file from the manufacturer that I purchased from got lost during my "upgrade" to Windows7...