Re: 155-0035-00

Colin Herbert

FYI, although there are no 155-0035 ICs there, someone on eBay is selling Tek 155 ICs. You just have to travel to Camberley, UK to pick them up:

I might point out that Camberley isn't far from London and that I have bought stuff from this seller happily. He usually posts stuff, so why he is only offering pick up on things that would go in a static-sensitive bag in a Jiffy-Bag I don't understand.


-----Original Message-----
From: [] On Behalf Of Dave Casey
Sent: 05 August 2020 01:50
Subject: Re: [TekScopes] 155-0035-00

Page 3-6 of the 1982 Semiconductor common design parts catalog lists the
Tek made (155) ICs.

Dave Casey

On Tue, Aug 4, 2020 at 7:09 PM Dennis Tillman W7pF <@Dennis_Tillman_W7pF>

Hi pitti_pu,
I am puzzled by this part number. The 7L5 service manual confirms it is
correct but there are no 155-0035 ICs. In fact there are no ICs starting
with 155 in any of the Tek Semiconductor or IC parts catalogs I have.

Can someone point me to a list of Tek ICs that does have the 155-xxxx IC
in it?

Dennis Tillman W7pF

-----Original Message-----
From: [] On Behalf Of
Sent: Tuesday, August 04, 2020 11:27 AM
Subject: [TekScopes] 155-0035-00

The spectrum analyzer 7L5 contains two 155-0035-00 quad op amps. One of
the four was faulty. No direct replacement was available. Therefore, I
disconnected the three affected pins, then piggy-backed a LM324 in place
with ±15V lines attached to the 115-0035 and added three wires for the
socket. The remaining three op amps in the LM324 are not used.
Works nicely. The gain/bandwidth product of the LM324 is much smaller, but
that does not affect the performance.

Dennis Tillman W7pF
TekScopes Moderator

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