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Original Message

MQ introduces a new limited series of output tranneys

Posted by MQracing on May 14, 2004 at 08:31:51:
Hi folks:
Here is a newly designed series of output transformers that I've wanted to build for a long, long time. The aim of the series is twofold. First is to offer a transformer for folks who are bi-amping and don't need the huge inductances and core capabilities of say our FS-030 output transformer. The second aim/goal was to make it good enough (full range) to serve as a high quality entry level output trans.
But... I did not want to do the so-called "universal" type output trans... where by mischeivious juggling of voltage ratios you make beleive that your trans is at one time a 2.5K, 5K or 10K trans.... physics just doesn't work that way or co-operate with that strategy in most cases...
yet... I wanted some flexibility in the design... so here is what Robin Hood and I came up with....

The "Robin Hood" name in honor of the man who took from the rich to give to the poor.... will be available in the following configurations...

All are 5K primary impedances with a UL tap at 50%. The first three models are designed to carry unbal dc currents. The last type (appropiately labeled) is for parafeed applications.

******************************************************************
RH-80
5,000 ohm pri with 50% UL tap
8 and 16 ohm secondaries
80 madc unbal current capacity
20 henries of primary L
15 watts @ 50 hz power capability
small signal response (varies a bit with source impedance) should be good from about 25 hertz to 25,000 hertz minimum.
recommended applications: high current 300B

********************************************************************

RH-60
5,000 ohm pri with 50% UL tap
8 and 16 ohm secondaries
60 madc unbal current capacity
30 henries of primary L
10 watts @ 45 hz power capability
small signal response (varies a bit with source impedance) should be good from about 25 hertz to 25,000 hertz minimum.

first example from WE for 300B
plate volts 350
grid bias -76
dc plate current 50 madc
5000 ohm load impedance
6.2 watts output
second and third HD; -30db and -45db respectively
Here is a second example from WE for 300B
plate volts 400
grid bias -87
dc plate current 60 madc
5000 ohm load impedance
8.3 watts output
second and third HD; -30db and -46db respectively

********************************************************************
RH-40
5,000 ohm pri with 50% UL tap
8 and 16 ohm secondaries
40 madc unbal current capacity
40 henries of primary L
5 watts @ 30 hz power capability
small signal response (varies a bit with source impedance) should be good from about 15 hertz to 25,000 hertz minimum.
recommende applications: this configuration is designed to support the 45, 71A and other similar triodes.

********************************************************************
RH-PF
this is the paralell feed Robin Hood.
5,000 ohm pri with 50% UL tap
8 and 16 ohm secondaries
ZERO madc unbal current capacity
greater than 200 henries of primary L with M6
12.5 watts @ 20 hz power capability
small signal response (varies a bit with source impedance) should be good from about 10 hertz to 25,000 hertz minimum.
recommended applications: many, many known applications
Please note: the parallel feed version can be custom built on nickel lams or the new generation "domain refined" silicon steel laminations. Inquiries preferred by phone for this option.
********************************************************************
These are really nice coils... and we didn't skimp much in the goodies department. All of the RH series are made with teflon insulation on the inside. All soldered connections are made with silver bearing solder. All units are housed in a brass channel frame with easy to solder to lugs.

I will *probably* only offer this series for a very, very short period of time... Robin Hood doesn't give a poop... but I ain't gonna get rich building these :=) Plus... it's more fun to do limited series of tranneys...
so... if your interested... you can sign up for your choice of the RH models outlined above for $75 each.

Please, please, please... these are the ground rules....
1) delivery will be four to six weeks out.... please don't send me an email in four days asking if your order has shipped... it will not have been shipped this early....
2) these are only available through MQ directly... you must call or email to get on the list. we accept payment via paypal or USPS money orders only. Paypal address for me is acrosound@aol.com
my phone number is 215-288-4816.
feel free to ask any questions on the forum here re: the RH series....
and if you guys can help fill in some apps for the differing models that would be much appreciated....

enjoy,
Mike