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2359glenn | studio - Page 415

post #6211 of 11701
Anyone know which VT25 or 10Y tubes have the thoriated tungsten? Some of them are oxided coated but which one which?
post #6212 of 11701
The ones with the smaller plate company's likeRCA made them both ways but the throated always had the smaller plate
post #6213 of 11701
a
Quote:
Originally Posted by 2359glenn View Post

The ones with the smaller plate company's likeRCA made them both ways but the throated always had the smaller plate

Thanks Glenn. Just took my pre out from storage and forgot the darn thing have a gain dial. So my future dht amp might use the type 10 after all.
post #6214 of 11701
What is the SQ of this preamp ??

If this isn't a high quality preamp the SQ will only be as good as the preamp.

Is it tube or SS ?

I ask this because my amps are a # 10 driving a 300B with a preamp using a # 26 DHT
When I built Clayton's amps and Ultra's amp with the C3g driver it sounded as good everything was the same
same output transformers the only difference was the driver. If I was going to do it allover again I would use
the C3g and omit the preamp.
post #6215 of 11701
Tube rectifier (6X4). A pair of 12AX7 tubes are the input/gain stages. 12AU7 tubes are also employed in the feedback loop of the gain control. Some specifications: Maximum output voltage: 20V Frequency response; 15Hz-60KHz (+-1dB) THD:0.8% (1KHz) Output impedance: 1K Signal to noise: 90dB.

Its the Eastern Electric Avant. Got it 2 year ago before committing mostly to headphones. Hope that helps.
post #6216 of 11701
I don't know if you want to use anything with feed back

You can try to hook it up to the OTL put the tone controls on flat and see how much it changes the sound.
Turn down the volume on the OTL and use the volume on the preamp.
This should give you a idea how much it changes the sound.
post #6217 of 11701

Pair of 300B Sophia carbon plate tubes for sale on Audio Circle.

post #6218 of 11701
They won't let new user send pm.
post #6219 of 11701

Are you interested? If so maybe I could help as I am a user with privilege.

post #6220 of 11701
Quote:
Originally Posted by rnadell View Post
 

Are you interested? If so maybe I could help as I am a user with privilege.


Thanks but I think I will pass, I have the Sophia 300B mesh already and like to save up for the EML.

post #6221 of 11701
Quote:
Originally Posted by jc9394 View Post
 


Thanks but I think I will pass, I have the Sophia 300B mesh already and like to save up for the EML.

 

sell all and buy these + a pair of 422A, then your journey will be over.

 

http://www.ebay.com/itm/Western-Electric-300B-matched-pair-s-n-211551-211552-manufactured-2-19-1998-/141107127953?pt=Vintage_Electronics_R2&hash=item20daa3e691

post #6222 of 11701

Those are reissues that were selling for 800.00 pair in 1998. They are not the original 300B

post #6223 of 11701
I will pay up to $1200 with the reissue, definitely not anything more.
post #6224 of 11701
they rare now though
post #6225 of 11701
Thread Starter 

My rig is slowly emerging. The monaural amps were designed around the storied Siemens F2a power tube. The glass has its roots in 1950s German Cinema, in the same way Western Electric 300Bs has its roots in 1930s cinema over here.

 

967274

 

967275

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