Frequency respond of guitar/bassamp's OPT? - diyAudio
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Old 27th October 2008, 02:48 AM   #1
diyAudio Member
Join Date: Jan 2006
Location: hanoi
Default Frequency respond of guitar/bassamp's OPT?

Hi everyone
I'm currently trying to build a guitaramp, begin with an OPT, and one of the key point here is the Frequency Respond, which decides how much iron/copper you should put in your OPT, and the performance of it as well.
According to GEOFEX here, the low cut for the OPT should be the lowest frequency of the instrument (bass/guitar, ie 41/82 Hz). But I still wonder if Fender/Marshall... follow this guide too, because in some Fender 200W bassamp, I can see the OPT is surprisingly small, giving a different lowcut.
So, the thing I want to ask here, is could anyone give me some data of the Frequency Respond of some brand OPT (which is really rare in my country), or some guide about this issue, so that I can determine the design of my OPT.
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Old 27th October 2008, 09:32 AM   #2
Bone is offline Bone  United Kingdom
diyAudio Member
Join Date: Jun 2004
Location: Dorset, UK
The frequency response of the transformer is not determined by the size of it - that determines the power it will handle - but the type of iron in the laminations (core).
A 50VA mains transformer will be approximately the same size as a 50Watt output transformer! Or it was when I was at college.

You could in fact use a rewired mains transformer for bass as the 'better' iron laminations only increase the higher frequency response.

This site - has useful some information on audio transformers.

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