Rocket PT order

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Posts: 28
Joined: Sat Oct 16, 2010 10:53 am
Location: Melbourne Australia

Rocket PT order

Post by crafty1 » Mon Oct 10, 2011 2:09 am

I am going to place an order for some Rocket spec power transformers for Australia/NZ conditions ( 240v - 50hz ). These will be indentical to the Heyboer and Pacific ones sold by other members on this forum manufactured for north American conditions.

The only difference may be they wiring colour coding. I have had units made by this local manufacturer for me in past and i can assure you they are of excellent quality. I am not looking to profit, the price per unit will be the actual cost to me. Only extra cost will be for postage as usual.

Specs: 280-250-0-250-280 @ 300ma
5v filament @ 3A
6.3 Heater @ 7.5A
240v / 50Hz primary.

Please PM me for expressions of interest. I hope to have a price in the coming days.



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Australian Transformer

Post by sethyrish » Tue Oct 11, 2011 12:36 am

Hi crafty1. Interested. Have PMed you.

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Location: Melbourne, Australia

Re: Rocket PT order

Post by Beerman » Wed Oct 12, 2011 10:52 pm

Thanks anyway Rich. I got it sorted already.

You getting these made by Dan at AVAT?
Cheers and Beers.

Posts: 28
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Location: Melbourne Australia

Re: Rocket PT order

Post by crafty1 » Thu Oct 13, 2011 6:09 am

No. I have spoken to him though.


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RJ Guitars
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Re: Rocket PT order

Post by RJ Guitars » Fri Oct 14, 2011 6:55 pm

I am hopeful you guys can get someone to wind trannies for you there. The shipping to the land down under is absurd especially when you just need something like a single output tranny. Also I've only had two bad trannies ever from Heyboer - turns out both of them went to Australia so that makes the customer service challenging beyond the norm.

Edcor will wind them using the M6 steel and with 240V primaries and I usually carry a few of them in stock but a local source would be much more useful to you guys.


Posts: 28
Joined: Sat Oct 16, 2010 10:53 am
Location: Melbourne Australia

Re: Rocket PT order

Post by crafty1 » Sat Oct 15, 2011 5:15 am

Tansformer Companies build PT's with the description " international spec voltage " which does cover most world conditions but not all. Some good quality manufacturers do offer true 220, 230 and 240v.
What happens is that a 240v spec PT is made. The secondary HT values are correct but all other secondary taps are not. Heater supply and rectifier filament voltages ( loaded ) are high.
Sometimes heaters are over 7v. Place a Variac between the amp and wall socket, lower the voltage so the heaters read correct and what do you know - the supply voltage is around 225 - 230v.
Sometimes amplifier manufacturers just blatently equip the amp with a 230v spec PT and label it as AU mains so all secondary voltages are higher.

In fairness, The greater market for these type of products are for the regions that require 120 - 230v mains power so that is what is catered for.
Australia and New Zealand is not economically viable on a global scale so i can understand the reasoning.

No prejudice to manufacturers outside Australia, this is just fact and big reason why i am ordering Rocket spec PT's for AU builders.

This may explain why RJ has had problems with PT's shipped to Australia.

To Aussies reading this post who have been asking me where to get the best OT's for Rockets, check out RJ's website. He has the best product range and prices, not to mention he is a good guy to deal with.


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Location: Newcastle, Australia

Re: Rocket PT order

Post by camerongrieve » Sat Oct 15, 2011 8:51 am

The standard was apparently changed to 230V +10% -6% (216V - 253V) but no one told the electricity providers

I always get mid-250's here :roll:

There are some Chinese manufactured transformers for sale that are marketed as being suitable for Australian voltages, but on closer inspection, secondary voltages are spec'd for 60Hz :shock:

Posts: 28
Joined: Sat Oct 16, 2010 10:53 am
Location: Melbourne Australia

Re: Rocket PT order

Post by crafty1 » Sun Oct 23, 2011 11:47 am

Ok, I have received the first PT to trial in my Rocket build. below are some pics for comparison.
I Fitted this PT to my amp on Thursday and did a show with it last night with no problems at all.

As wall voltages do vary, the manufacturer spec'd it to 243v primary as this is the average mains voltage out of the wall now days. Some areas may be different. As it happened when i tested it in the amp and under load i measured the following,

AC mains: 242v
High sec tap: 282v
Low sec tap: 252v
Heaters: 6.5v
Filament: 4.98v

Test amp has a DC current draw around 170ma.

As mentioned before the wiring colours are slighlty different to those used by other manufacturers.
The other slight variation as can be seen on the attached pics is that the stack appears to be slighlty wider. The core stack is exaclty the same however the end bells are deeper. The Heyboer made units have a shallower end bell on one end. These units have the deeper bells on both ends making it approximately 10mm wider however the mounting footprint is the same as the Heyboers units.
They do also have the copper band around the stack. You may not see it in the pics as it is painted black.

Cost per unit is $176.00 AUD incl + postage.
I will be ordering 6 units for now. Feel free to ask questions on this forum page or PM me.


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