Tube pre, not much gain, ideas?

Member for

16 years 3 months
Submitted by took-the-red-pill on Sat, 05/07/2005 - 00:11

Hi guys,

For you electronics wizzes out there, i'll try to give you the reader's digest version, for the rest of you, this will be a VERY boring post:

I bought an old tube pre at a garage sale for $5 (altec Lansing 1567A, hand wired, all tube, decades old)

I had it converted to 4 into 4. I have 2 of the original mic transformers("Peerless 4722," 38/150:50K)

the signal is nice and rich, but pretty weak.

The other 2 channels are awaiting my transformer purchase.

I'm wondering if I can get 'hotter' transformers for the other 2 channels, to get more gain, or will it just bring up the noise floor with it?

Of the 3 numbers given, which one(s) would I be looking to change to get more gain?


Member for

18 years 3 months


Sat, 05/07/2005 - 01:59

I had a quick look at the 1567A diagram.Looks like one half of a dual-triode is allocated to each channel.
Changing the transformer will only get you so much more gain.
Is V3 being utilized?