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Author Topic: Laney VC30 Output Transformer  (Read 844 times)

ilyaa

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Laney VC30 Output Transformer
« on: December 12, 2019, 01:06:25 AM »
if you were replacing a blown OT in this 30 Watt, 4xEl84 amp, which one would you get?

https://www.mojotone.com/amp-parts/Output-Transformers/Black-Brown-Vibrolux-Tremolux-Output-Transformer-4-8-OHM

or

http://www.triodeelectronics.com/22bastou.html

(not sure if they have that one - i e-mailed em)

or

https://www.mojotone.com/amp-parts/Output-Transformers/GA30RV-RVH-Output-Transformer

or

any other suggestions?

part of my issue is the stock transformer thats in the amp is very small - its snuggled between the second preamp 12ax7 and the PI - would like to find something small so i dont have to destroy the chassis putting the new one in.....

thank you!

phatt

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Re: Laney VC30 Output Transformer
« Reply #1 on: December 12, 2019, 09:01:56 AM »
The links are mostly for 6V6, you need a Tx for EL84.
IIRC a quad of EL84 needs a primary winding plate to plate of 4k.  Pri Z is usually just written as (4k pp) on data sheets.
Others here might know places in your location to find a Tx that will work well for that amp.
Phil.

ilyaa

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Re: Laney VC30 Output Transformer
« Reply #2 on: December 12, 2019, 08:15:51 PM »


phatt

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Re: Laney VC30 Output Transformer
« Reply #4 on: December 13, 2019, 12:03:26 AM »
1760J looks like it would be close.

Generally a pair of 6V6 use ~6k pp
while a pair of EL84 would be ~8k pp

The reality is,
there are many OT parameters that effect the final outcome.
Phil